Crossword Genius

A couple of cartons for town drunk, grabbing nap (3,5)

Ross

I believe the answer is:

two dozen

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

'a couple of cartons' is the definition.
I can't judge whether this definition defines the answer.

'town drunk grabbing nap' is the wordplay.
'drunk' is an anagram indicator.
'grabbing' is an insertion indicator.
'nap' becomes 'doze' (dozing is a kind of napping).
'town' with letters rearranged gives 'twon'.
'twon' enclosing 'doze' is 'TWO DOZEN'.

'for' acts as a link.

Can you help me to learn more?

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