Crossword Genius

Informally, we first breakfast over porridge (5)

Ross

I believe the answer is:

brits

'informally we' is the definition.
(informal term for British people)

'first breakfast over porridge' is the wordplay.
'first breakfast' becomes 'b' (1st letter of 'breakfast').
'over' says the letters should be written in reverse.
'porridge' becomes 'stir' (both are slang terms for prison).
'stir' reversed gives 'rits'.
'b'+'rits'='BRITS'

(Another definition for brits that I've seen is " Islanders".)

I've seen this clue in The Guardian.
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