Revision of Garson very cheap (3,1,4)

I believe the answer is:

for a song

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

'cheap' is the definition.
(thesaurus)

'irevision of garsoni very' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is found within the answer.
'very' could be 'so' (both can mean 'extremely') and 'so' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for for a song that I've seen is " Very reasonably".)

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

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