Fixes charge, say (5)
I believe the answer is:
tacks
'fixes' is the definition.
(tacking is a kind of fixing)
'charge say' is the wordplay.
'charge' becomes 'tax' (tax is a kind of charge).
'say' shows a homophone (sound like).
'tax' sounds like 'TACKS'.
(Other definitions for tacks that I've seen before include "Changes course" , "They fix" , "Fixes" , "a few points" , "They secure" .)