Its cost upset hot Glaswegian (8)

I believe the answer is:

scottish

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'glaswegian' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?

'its cost upset hot' is the wordplay.
'upset' indicates an anagram.
'hot' becomes 'h' (common abbreviation eg on taps).
'its'+'cost'='itscost'
'itscost' anagrammed gives 'scottis'.
'scottis'+'h'='SCOTTISH'

Can you help me to learn more?

(Other definitions for scottish that I've seen before include "from 18 [MORAY], say?" , "From north of the border" , "northern folk" , "tongue" , "Costs hit this nationality badly" .)

I've seen this clue in The Daily Express.

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