Crossword Genius

... which one drinking coffee raises? (3,2)

Ross

I believe the answer is:

mug up

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If this is the answer, I'm afraid I cannot explain it.

Can you help me to learn more?

(Other definitions for mug up that I've seen before include "Study quickly (for, eg, an exam)" , "Study intensively" , "Make an intensive study" , "Study hard" , "Learn (subject) quickly" .)

I've seen this clue in The Times.
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