Substitute's reputation not good (5-2)
I believe the answer is:
stand-in
'substitute's' is the definition.
(synonyms)
'reputation not good' is the wordplay.
'reputation' becomes 'standing' (one's standing is one's reputation or status).
'not' is a deletion indicator.
'good' becomes 'g' (abbreviation).
'standing' with 'g' taken out is 'STAND-IN'.
(Another definition for stand-in that I've seen is " Substitute".)
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