Crossword Genius

Celtic fan, perhaps, sawing a leg off (10)

Ross

I believe the answer is:

glaswegian

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

'celtic fan' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'sawing a leg off' is the wordplay.
'off' is an anagram indicator.
'sawing'+'a'+'leg'='sawingaleg'
'sawingaleg' anagrammed gives 'GLASWEGIAN'.

'perhaps' is the link.

Can you help me to learn more?

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

I've seen this clue in The Guardian.
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