Language of an alliterative wizard? (5)
I believe the answer is:
welsh
'language' is the definition.
(Welsh is an example)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for welsh that I've seen before include "From Aberystwyth, perhaps" , "Native to, eg, Cardiff" , "tongue" , "Evade obligation" , "Leave without paying" .)