Contempt for small crop (5)
I believe the answer is:
scorn
'contempt' is the definition.
(I know that contempt can be written as scorn)
'small crop' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'crop' becomes 'corn' (a farmer's crop of corn).
's'+'corn'='SCORN'
'for' acts as a link.
(Other definitions for scorn that I've seen before include "Look at with disdain" , "Disgust" , "Open disrespect" , "Deride, show contempt for" , "Reject contemptuously" .)