Crossword Genius

According to Spooner, bargain: money for lingerie (6,4)

Ross

I believe the answer is:

garter belt

I'm a little stuck... Click here to teach me more about this clue!

'lingerie' is the definition.
(I know that garter belt is a type of undergarment)

I can't explain the remainder of the clue.

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.
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