Crossword Genius

One-time undergarment? (7)

Ross

I believe the answer is:

singlet

'undergarment' is the definition.
(singlet is a kind of undergarment)

'one-time' is the wordplay.
'one' becomes 'single' ('single' can be a synonym of 'one').
'time' becomes 't'.
'single'+'t'='SINGLET'

(Other definitions for singlet that I've seen before include "Tingles in vest" , "Something to wear" , "Sleeveless shirt" , "garment worn by men" , "top gear" .)

I've seen this clue in The Telegraph and The Sun.
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