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In politics, briefly, it's a bit of an alibi (3)

Ross

I believe the answer is:

lib

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'in politics briefly' is the definition.
I can't judge whether this defines the answer.

'a bit of an alibi' is the wordplay.
'a bit of' indicates the answer is hidden within the clue.
'LIB' is hidden in the letters of 'alibi'.

'it's' acts as a link.

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I've seen this clue in the Evening Standard.
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