They might give notes for performers in underwear (1-7)

I believe the answer is:

g-strings

I believe this clue is a double definition.

'they might give notes for performers' is the first definition.
(eg G-strings on guitars)

'underwear' is the second definition.
(G-string is a type of undergarment)

'in' acts as a link.

I've seen this clue in The Guardian.

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