Maybe barista’s warning, still, of criminal? (7)

I believe the answer is:

mugshot

'still of criminal?' is the definition.
(a photograph of a criminal)

I can't explain the rest of the clue.

(Other definitions for mugshot that I've seen before include "picture" , "Passport photograph?" , "Photo of criminal" , "Still capturing the culprit" , "In slang, photo of criminal's face in police records" .)

I've seen this clue in The Times.

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