Crossword Genius

Sporadically Bologna immured southern Belgians? (8)

Ross

I believe the answer is:

walloons

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

'sporadically bologna immured' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'southern belgians?' is the wordplay.
I cannot quite understand how this works, but
'southern' could be 's' (abbreviation) and 's' is found in the answer.
The remaining letters 'walloon' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for walloons that I've seen is " People who live in S Belgium and speak French dialect".)

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