Unexpected piece of good fortune (8)

I believe the answer is:

windfall

'unexpected piece of good fortune' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for windfall that I've seen before include "Piece of unexpected good fortune, or an apple on the ground" , "Bruised apple" , "Unexpected gain" , "Lucky acquisition" , "Piece of luck (but it might be bruised)" .)

I've seen this clue in the Sydney Morning Herald.

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