Crossword Genius

On best diet for stripping off full-body suit (6)

Ross

I believe the answer is:

onesie

'full-body suit' is the definition.
(a onesie is a one-piece garment)

'on best diet for stripping off' is the wordplay.
I cannot quite see how this works, but
'on' is found in the answer.
This explanation may well be incorrect...

(Other definitions for onesie that I've seen before include "Single-piece full body garment" , "One-piece full-body garment" .)

I've seen this clue in The Independent.
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