Crossword Genius

Expert solver will do this (5)

Ross

I believe the answer is:

crack

I'm a little stuck... Click here to teach me more about this clue!

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

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for crack that I've seen before include "Work out" , "Chat" , "Narrow opening; joke" , "snap" , "Drug - solve" .)

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