SEAL waging wars from northern city (10)

I believe the answer is:

glaswegian

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

'northern city' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'seal waging wars' is the wordplay.
'wars' is an anagram indicator (I've seen 'warring' mean this).
'seal'+'waging'='sealwaging'
'sealwaging' with letters rearranged gives 'GLASWEGIAN'.

'from' is the link.

Can you help me to learn more?

(Other definitions for glaswegian that I've seen before include "Celt?" , "Scotsman" , "Scot" .)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.