Crossword Genius

Knock in a lazy kind of way, yet quickly (7)

Ross

I believe the answer is:

rapidly

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

'quickly' is the definition.
(I know that quickly can be written as rapidly)

'knock in a lazy kind of way' is the wordplay.
I cannot quite understand how this works, but
'knock' could be 'rap' (synonyms) and 'rap' is present in the answer.
The remaining letters 'idly' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'yet' acts as a link.

Can you help me to learn more?

(Other definitions for rapidly that I've seen before include "Speedily" , "Quickly" , "right off the bat" , "At a great rate" , "Fast" .)

I've seen this clue in the Evening Standard.
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