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Stuff about Northern Ireland by posh nutcase (7)

Ross

I believe the answer is:

cranium

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'nutcase' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'stuff about northern ireland by posh' is the wordplay.
'stuff' becomes 'cram' (cramming is a kind of stuffing**).
'about' means one lot of letters goes inside another.
'northern ireland' becomes 'ni'.
'by' means one lot of letters go next to another.
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-u).
'ni'+'u'='niu'
'cram' placed around 'niu' is 'CRANIUM'.

Can you help me to learn more?

(Other definitions for cranium that I've seen before include "hard case" , "The skull, bone enclosing brain" , "Skull, bones enclosing brain" , "The skull, major head bone" , "Part of the skull" .)

I've seen this clue in The Sun and The Telegraph.
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