Sporadically Bologna immured southern Belgians? (8)
I believe the answer is:
walloons
'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".)