Crossword Genius

Top nude worked out, firm through exercise (5,2)

Ross

I believe the answer is:

toned up

'firm through exercise' is the definition.
(as in toned up muscles)

'top nude worked out' is the wordplay.
'worked out' indicates anagramming the letters.
'top'+'nude'='topnude'
'topnude' anagrammed gives 'TONED UP'.

(Another definition for toned up that I've seen is " became healthier".)

I've seen this clue in The Times.
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