Local talk garbled in citadel (7)

I believe the answer is:

dialect

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'local' is the definition.
(thesaurus)

'talk garbled in citadel' is the wordplay.
'citadel' can be anagrammed to 'DIALECT'.
Though, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for dialect that I've seen before include "Manner of speaking" , "Local language variant" , "type of language" , "Regional form of word" , "Regional version of a language" .)

I've seen this clue in The Sun.

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