Crossword Genius

That Scottish G string? (5)

Ross

I believe the answer is:

thong

'string?' is the definition.
(a G-string is a type of thong)

'that scottish g' is the wordplay.
'that scottish' becomes 'thon' (Scottish word meaning 'that' or 'that one').
'thon'+'g'='THONG'

(Other definitions for thong that I've seen before include "Strip of leather used for fastening" , "G-string" , "Narrow strip of leather (or other material)" , "Skimpy garment" , "Insubstantial underwear" .)

I've seen this clue in The Independent.
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