These are the 5 Clusters of Clinging! The Noble 8-fold Way should indeed
be developed for the direct experience of these five Clusters of Clinging,
for the full understanding and elimination of them, and for their final
overcoming, abandoning and leaving all behind…This Noble 8-fold Way is
developed for the uprooting of all these five Clusters of Clinging!

Explanation:
The Cluster of Clinging to Form is internally to one's ‘own body’ & externally
to what is appearing as ‘my world’ and the bodies of others..
The Cluster of Clinging to Feeling is the obsession with pleasant feeling,
fear of painful feeling & obstinate indifference towards neutral feeling…
The Cluster of Clinging to Perception is the monomaniac fascination of the
manifold, diverse, and momentarily tantalizing objects of the six senses…
The Cluster of Clinging to Construction is fixated passion for intending,
planning, attending, thinking, hoping, wanting, willing and worrying…
The Cluster of Clinging to Consciousness is the addiction to all that is seen,
heard, smelt, tasted, touched, and cognized…
Cluster of Clinging means an assemblage, bunch, clump, collection, group,
or knot of a tightly adhering collection of variegated attachment!
There is nothing here ‘outside’ or ‘apart’ from these clusters of clinging,
neither internally, nor externally! This 5-fold classification covers all...
The cause of clinging is craving. The effect of clinging is becoming.

More on these 5 Clusters of Clinging (Khandha):
http://What-Buddha-Said.net/drops/Any_Kind.htm
http://What-Buddha-Said.net/drops/Not_Yours.htm
http://What-Buddha-Said.net/drops/The_Leash.htm
http://What-Buddha-Said.net/drops/II/Like_Foam.htm
http://What-Buddha-Said.net/drops/Fingernail_of_Soil.htm
http://What-Buddha-Said.net/drops/Acquisition_of_Fuel.htm
http://What-Buddha-Said.net/drops/IV/Clustered_Truths.htm
http://What-Buddha-Said.net/drops/II/The_Burning_Five.htm
http://What-Buddha-Said.net/drops/IV/Stilling_of_Clinging.htm
http://What-Buddha-Said.net/library/DPPN/wtb/g_m/khandha.htm
http://What-Buddha-Said.net/drops/II/The_5_Clusters_of_Clinging.htm
http://What-Buddha-Said.net/drops/II/Things_that_can_be_clung_to.htm
http://What-Buddha-Said.net/drops/What_are_the_5_Clusters_of_Clinging.htm

Source (edited extract):
The Grouped Sayings of the Buddha. Samyutta Nikāya.
Book [V:60-1] section 45: The Way. 178: The 5 Cluster of Clinging...