Sean Cash's problem? A Pom in Glasgow! (9)

I believe the answer is:

sassenach

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

'a pom in glasgow' is the definition.
I can't judge whether this defines the answer.

'sean cash's problem?' is the wordplay.
'problem?' indicates anagramming the letters (I've seen 'problem' mean this).
'sean'+'cashs'='seancashs'
'seancashs' anagrammed gives 'SASSENACH'.

Can you help me to learn more?

(Other definitions for sassenach that I've seen before include "In Scotland, English" , "who comes from England?" , "English person (to a Scot)" , "Englishman, Lowlander" , "Lowland Scot" .)

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

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