Fancy putting limit on crop (7)
I believe the answer is:
caprice
'fancy' is the definition.
(I've seen this in another clue)
'limit on crop' is the wordplay.
'limit' becomes 'cap' (capping is a kind of limiting).
'on crop' becomes 'rice' (I can't explain this - if you can you should give a lot more credence to this answer).
'cap'+'rice'='CAPRICE'
'putting' acts as a link.
Can you help me to learn more?
(Other definitions for caprice that I've seen before include "'Impulse, whim (7)'" , "Whimsy" , "Sudden whim" , "Sudden impulse" , "Sudden mood change" .)