Crossword Genius

Security arrest gangster casing empty theatre (10)

Ross

I believe the answer is:

collateral

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'security' is the definition.
(collateral is a kind of security)

I can't explain the remainder of the clue.

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(Other definitions for collateral that I've seen before include "Aside from the main issue" , "subsidiary" , "Confirmatory - recall a lot (anag)" , "Secondary; parallel" , "damage?" .)

I've seen this clue in The Independent.
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