Casanova slims down, turning jacket around (7)

I believe the answer is:

seducer

'casanova' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for seducer that I've seen before include "Rescued (anag) - Lothario" , "Wolf" , "Philanderer" , "Womaniser, libertine" , "Casanova, for example" .)

I've seen this clue in The Guardian.

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