Chop rotten at one end consumed by rodents (5)
I believe the answer is:
mince
'chop' is the definition.
(chopped meat)
'rotten at one end consumed by rodents' is the wordplay.
'at one end' says to take the final letters.
'consumed by' indicates putting letters inside (inserted letters get consumed).
'rodents' becomes 'mice' (mouse is a kind of rodent).
The final letter of 'rotten' is 'n'.
'n' going inside 'mice' is 'MINCE'.
(Other definitions for mince that I've seen before include "Simper" , "Chop food into small bits" , "Grind (food)" , "Finely chopped meat" , "Ingredient of 8 across" .)