Crossword Genius

Gust in this bay not unknown, swimming in these? (7,5)

Ross

I believe the answer is:

bathing suits

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'these?' is the definition.
The definition suggests an adverb but the answer is not.

'gust in this bay not unknown swimming' is the wordplay.
'not' is a deletion indicator.
'unknown' becomes 'y' (algebra).
'swimming' is an anagram indicator.
'gust'+'in'+'this'+'bay'='gustinthisbay'
'gustinthisbay' with 'y' taken away is 'gustinthisba'.
'gustinthisba' anagrammed gives 'BATHING SUITS'.

'in' acts as a link.

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I've seen this clue in The Telegraph.
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