Crossword Genius

Colour of smock chap uncovered (5)

Ross

I believe the answer is:

mocha

'colour' is the definition.
(mocha is a shade of brown)

I don't understand the rest of the clue.

(Other definitions for mocha that I've seen before include "Leather" , "Arabian coffee" , "Coffee flavour" , "Yemeni port; type of coffee bean" , "It may end up as grounds" .)

I've seen this clue in The Times.
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