Fee puts pressure on crop (5)
I believe the answer is:
price
'fee' is the definition.
(I've seen this before)
'pressure on crop' is the wordplay.
'pressure' becomes 'p' (scientific abbreviation).
'on crop' becomes 'rice' (I can't justify this - if you can you should give a lot more credence to this answer).
'p'+'rice'='PRICE'
'puts' is the link.
Can you help me to learn more?
(Other definitions for price that I've seen before include "Jordan?" , "Cost of purchase" , "Amount needed to purchase something" , "Listed cost" , "Fee" .)