Quite a selection including prickly plant (6)
I believe the answer is:
teasel
'prickly plant' is the definition.
(I've seen this before)
'quite a selection including' is the wordplay.
'including' indicates a hidden word.
'TEASEL' is hidden in the letters of 'quite a selection'.
(Other definitions for teasel that I've seen before include "it helps us to nap" , "Plant with spiny purple flower heads" , "Prickly plant (S, not Z)" , "Herb with prickly flower heads -- elates (anag)" , "Plant with prickly flower heads" .)