Crossword Genius

Crude form of fishing (6)

Ross

I believe the answer is:

coarse

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

'crude' is the definition.
(synonyms)

'form of fishing' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is present in the answer.
The remaining letters 'carse' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for coarse that I've seen before include "Rought or crude" , "Unpolished -- ribald" , "Vulgar; not fine" , "Rough in texture or crude in manner" , "Unrefined; rough" .)

I've seen this clue in The Mirror.
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