Crossword Genius

Do well to answer verbally. "What is XX plus XX?" (5)

Ross

I believe the answer is:

excel

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'do well' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for excel that I've seen before include "cap" , "Perform exceptionally well" , "Be highly proficient" , "Do really well, outshine others" , "Top" .)

I've seen this clue in the Evening Standard.
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