Fine forms aplenty (7)
I believe the answer is:
penalty
'fine' is the definition.
(I've seen this before)
'forms aplenty' is the wordplay.
'forms' indicates an anagram.
'aplenty' with letters rearranged gives 'PENALTY'.
(Other definitions for penalty that I've seen before include "kick by footballer" , "Fine - handicap" , "Spot kick" , "Punishment eg for foul" , "Punishment; fine" .)