Crossword Genius

Perhaps the bra is mine? (5,4)

Ross

I believe the answer is:

booby trap

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'mine?' is the definition.
(booby trap is a kind of mine)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for booby trap that I've seen before include "hidden bomb, perhaps" , "concealed danger" , "mine?" , "Unexpected explosive device" , "Device for practical joke" .)

I've seen this clue in The Independent.
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