Crossword Genius

You wouldn't expect this bend on trip (8)

Ross

I believe the answer is:

windfall

'you wouldn't expect this' is the definition.
(a windfall is an unexpected source of money)

'bend on trip' is the wordplay.
'bend' becomes 'wind'.
'on' is a charade indicator (letters next to each other).
'trip' becomes 'fall' (fall is a kind of trip).
'wind'+'fall'='WINDFALL'

(Other definitions for windfall that I've seen before include "Apple blown from a tree" , "Bonus not expected" , "bonanza" , "unexpected blessing" , "Lucky bonus" .)

I've seen this clue in The Guardian.
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