Take a chance on body-search with top off (4)

I believe the answer is:

risk

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'take a chance' is the definition.
('risk' can be a synonym of 'take a chance')

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for risk that I've seen before include "Gamble" , "Assessment of potential dangers -- any silk saris (anag)" , "The possibility of danger - chance it" , "Endanger, jeopardise" , "Possibility of bad outcome" .)

I've seen this clue in The Telegraph.

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