It's in black enamel, you know (3)

I believe the answer is:

ken

'know' is the definition.
(I've seen this in another clue)

'it's in black enamel you' is the wordplay.
'it's in' indicates a hidden word.
'KEN' is hidden in the letters of 'black enamel you'.

(Other definitions for ken that I've seen before include "One's range of knowledge" , "Awareness" , "Understanding - boy's name" , "Know; man's name" , "Notice" .)

I've seen this clue in the Evening Standard.

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