What police raids disclosed in the art gallery? (5)

I believe the answer is:

busts

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

'what police raids disclosed' is the definition.
I can't tell whether this defines the answer.

'art gallery?' is the wordplay.
'art' becomes 'bust' (bust is a kind of art).
'gallery?' becomes 's' (I can't justify this - if you can you should believe this answer much more).
'bust'+'s'='BUSTS'

'in the' acts as a link.

Can you help me to learn more?

(Another definition for busts that I've seen is " Bosoms".)

I've seen this clue in the Evening Standard.

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