Food: tons ready to be harvested (5)
I believe the answer is:
tripe
'food' is the definition.
(tripe is a kind of food)
'tons ready to be harvested' is the wordplay.
'tons' becomes 't'.
'ready to be harvested' becomes 'ripe'.
't'+'ripe'='TRIPE'
(Other definitions for tripe that I've seen before include "which a freegan might eat?" , "Rubbish - it's ox stomach linings" , "Lining of the stomach of a cow as food" , "Edible nonsense?" , "Stomach for consumption; nonsense" .)