That side of Glasgow with its own language? (6)

I believe the answer is:

celtic

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'language?' is the definition.
(Celtic language is an example)

I don't understand the rest of the clue.

(Other definitions for celtic that I've seen before include "Scottish club" , "Like, eg, Welsh, Gaelic" , "Group of languages including Irish, Welsh, etc" , "Relating to Irish, Gaelic, Manx, Welsh, etc" , "Racial of Welsh, Irish etc." .)

I've seen this clue in the Evening Standard.

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