Autumn turns out to provide unexpected gains (9)

I believe the answer is:

windfalls

'unexpected gains' is the definition.
(I've seen this in another clue)

'autumn turns out' is the wordplay.
'autumn' becomes 'fall' (synonyms).
'turns' becomes 'winds' ().
'out' means one lot of letters goes inside another.
'fall' inserted inside 'winds' is 'WINDFALLS'.

'to provide' is the link.

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