Crossword Genius

How jailbirds party with oatmeal? (2,8)

Ross

I believe the answer is:

do porridge

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

'how jailbirds' is the definition.
I can't judge whether this defines the answer.

'party with oatmeal?' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'with' says to put letters next to each other.
'oatmeal?' becomes 'porridge' ('porridge' can be a synonym of 'oatmeal').
'do'+'porridge'='DO PORRIDGE'

Can you help me to learn more?

(Other definitions for do porridge that I've seen before include "Spend time in prison (colloq.)" , "detained" , "Get time" .)

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