Killers? Turn them in! (6)
I believe the answer is:
hitmen
'killers?' is the definition.
(I know this)
'turn them in' is the wordplay.
'turn' indicates anagramming the letters.
'them'+'in'='themin'
'themin' is an anagram of 'HITMEN'.
(Another definition for hitmen that I've seen is " Offers".)
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