Crossword Genius

Brilliant boy progresses quickly (6,2)

Ross

I believe the answer is:

cracks on

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'progresses quickly' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'brilliant boy' is the wordplay.
'brilliant' becomes 'crack' (I've seen this before).
'boy' becomes 'son' (male child).
'crack'+'son'='CRACKS ON'

Can you help me to learn more?

(Another definition for cracks on that I've seen is " makes quick progress".)

I've seen this clue in The Times and The Sunday Times.
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