Crossword Genius

A juicy mug (3)

Ross

I believe the answer is:

sap

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'mug' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for sap that I've seen before include "Charlie" , "Weaken; tree fluid" , "tunnel" , "Juice; energy" , "Drain - vital fluid" .)

I've seen this clue in the Evening Standard.
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