Crossword Genius

Socialist finding abandoned part of building (8)

Ross

I believe the answer is:

leftwing

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'socialist finding' is the definition.
The definition suggests a present participle verb which matches the answer.

'abandoned part of building' is the wordplay.
'abandoned' becomes 'left' (leave can mean to abandon).
'part of building' becomes 'wing' (wing can mean a part of a large building).
'left'+'wing'='LEFTWING'

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I've seen this clue in The Daily Express.
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