Reduced charge fixed for apple (6)
I believe the answer is:
russet
'apple' is the definition.
(I've seen this before)
'reduced charge fixed for' is the wordplay.
'reduced' means to remove the last letter.
'charge' becomes 'rush' (I've seen this before).
'fixed for' becomes 'set' (I can't explain this - if you can you should give a lot more credence to this answer).
'rush' with its last letter taken off is 'rus'.
'rus'+'set'='RUSSET'
(Other definitions for russet that I've seen before include "Dessert apple" , "Apple - colour" , "Brown; apple variety" , "Red/brown; a fabric; an apple" , "Autumnal red as of leaves" .)