Safe area for city's peculiar dialect (7)

I believe the answer is:

citadel

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'safe area for city's' is the definition.
I can't tell whether this defines the answer.

'peculiar dialect' is the wordplay.
'peculiar' is an anagram indicator (a peculiar or strange ordering of the letters).
'dialect' is an anagram of 'CITADEL'.

Can you help me to learn more?

(Other definitions for citadel that I've seen before include "secure place" , "place of refuge" , "Structure in place to protect" , "Fortress -- dialect (anag)" , "Stronghold usually within the walls" .)

I've seen this clue in The Independent.

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