What does the cryptic crossword clue "Skimpy underwear item is a bit of a fiddle (1-6)" mean?

The definition is "Skimpy underwear item is a bit of a fiddle". The wordplay uses a double definition. Double definition The answer is GSTRING.

Skimpy underwear item is a bit of a fiddle (1-6)

Guardian Cryptic #29465 | 19 Down | 2024-08-19 flower