Crossword Genius

Police photo of cup's stolen (3,4)

Ross

I believe the answer is:

mug shot

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

'police photo' is the definition.
(I've seen this before)

'cup's stolen' is the wordplay.
'cup's' becomes 'mugs' (I can't justify this - if you can you should give a lot more credence to this answer).
'stolen' becomes 'hot' (stolen goods are 'hot').
'mugs'+'hot'='MUG SHOT'

'of' is the link.

Can you help me to learn more?

(Other definitions for mug shot that I've seen before include "police will want this from him" , "Photograph taken for police records" , "Passport photograph?" , "Police photo" .)

I've seen this clue in the Sydney Morning Herald.
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