Crossword Genius

Glaswegian club for languages (6)

Ross

I believe the answer is:

celtic

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

This could be a double definition.

'glaswegian' is the first definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I can't see?

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

Can you help me to learn more?

(Other definitions for celtic that I've seen before include "Language group including Manx" , "This tiger is credited with Irish prosperity" , "Language group containing 14 & 15 across" , "Of a group of languages such as Gaelic and Welsh" , "The Sea between southern Ireland and Cornwall" .)

I've seen this clue in The Mirror.
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