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Policemen’s ball? You might be arrested there (3,4)

Ross

I believe the answer is:

cop shop

'you might be arrested there' is the definition.
(police station)

'policemen's ball?' is the wordplay.
'policemen' becomes 'cops' (cop is a kind of policeman).
'ball?' becomes 'hop' (informal dance event).
'cops'+'hop'='COP SHOP'

(Other definitions for cop shop that I've seen before include "office investigating crime" , "Nick" , "Police station (slang)" , "'Police station (3,4)'" .)

I've seen this clue in The Times.
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