4 down
Stand-in
accepts
credit
for
clean-up
(5)
Stand-in accepts credit for clean-up (5)
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The definition is at the end of the clue.
How the clue works
Stand-in gives you SUB, and credit is the usual abbreviation CR. SUB "accepts" CR tucked inside it, so you get S, then CR, then UB — and clean-up at the end is your definition.