1 down
Andrew,
once
at
Number
10,
managed
comeback
after
box
office
passed
bill
(5,3)
Andrew, once at Number 10, managed comeback after box office passed bill (5,3)
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The definition is at the beginning of the clue.
How the clue works
Look at Andrew, once at Number 10 — that's your definition, pointing to Andrew Bonar Law, a former Prime Minister who resided at Number 10 Downing Street. The wordplay builds him up piece by piece: box office gives you BO, then managed is RAN, which gets reversed for the comeback to give NAR, and finally a bill that has passed becomes LAW.