Implant I sent for adjustment (5)
I believe the answer is:
inset
'implant' is the definition.
(I've seen this before)
'i sent for adjustment' is the wordplay.
'for adjustment' is an anagram indicator (I've seen this in other clues).
'sent' anagrammed gives 'nset'.
'i'+'nset'='INSET'
(Other definitions for inset that I've seen before include "Reduced image" , "Tines (anag.)" , "Small piece inserted" , "Small picture within a large one" , "Synagogue singer" .)