Unique sort of shirt, this garment? (7)

I believe the answer is:

singlet

'this garment?' is the definition.
(singlet is a kind of garment)

'unique sort of shirt' is the wordplay.
'unique' becomes 'single' (similar in meaning).
'sort of shirt' becomes 't' (I've seen this in other clues).
'single'+'t'='SINGLET'

(Other definitions for singlet that I've seen before include "Underwear" , "underclothing" , "Sleeveless shirt" , "top gear" , "Sleeveless garment" .)

I've seen this clue in the Evening Standard.

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