About creek a man laughs raucously (7)

I believe the answer is:

cackles

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'laughs raucously' is the definition.
'cackles' can be an answer for 'laughs' (cackling is a kind of laughing). I'm unsure of the 'raucously' bit.

'about creek a man' is the wordplay.
'about creek' becomes 'cack' (I can't explain this - if you can you should give a lot more credence to this answer).
'a man' becomes 'Les'.
'cack'+'les'='CACKLES'

Can you help me to learn more?

(Other definitions for cackles that I've seen before include "Laughs harshly like witch" , "causing raucous laughter" .)

I've seen this clue in the Sydney Morning Herald.

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