Failure of fine crop (4)
I believe the answer is:
flop
'failure' is the definition.
(flop is a kind of failure)
'fine crop' is the wordplay.
'fine' becomes 'f' (abbreviation).
'crop' becomes 'lop' ('lop' can be a synonym of 'crop').
'f'+'lop'='FLOP'
'of' is the link.
(Other definitions for flop that I've seen before include "Community cards in poker" , "Theatrical failure" , "Failure - loll" , "crash" , "Dud - bomb" .)