Replacement chopper unwisely turned east (7)
I believe the answer is:
denture
'replacement chopper' is the definition.
(false tooth - something which bites or chops)
'unwisely turned east' is the wordplay.
'unwisely' is an anagram indicator.
'east' becomes 'e' (synonyms).
'turned' anagrammed gives 'dentur'.
'dentur'+'e'='DENTURE'
(Other definitions for denture that I've seen before include "Plate with artificial teeth" , "Set of false teeth" , "False teeth plate" , "Set of artificial teeth" .)