Crossword Genius

Language of an alliterative wizard? (5)

Ross

I believe the answer is:

welsh

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'language' is the definition.
(Welsh is an example)

I can't explain the remainder of the clue.

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(Other definitions for welsh that I've seen before include "From Aberystwyth, perhaps" , "Native to, eg, Cardiff" , "tongue" , "Evade obligation" , "Leave without paying" .)

I've seen this clue in the Evening Standard.
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