Vowel shifts disguise language (5)

I believe the answer is:

welsh

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

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

'vowel shifts disguise' is the wordplay.
'WELSH' is hidden in amongst the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for welsh that I've seen before include "Dresser, harp or rabbit" , "Owain Glyndwr?" , "Cymric" , "Nationality of Dai or Ivor" , "tongue" .)

I've seen this clue in The Mirror.

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