Translation of dialect in fortress (7)
I believe the answer is:
citadel
'fortress' is the definition.
(thesaurus)
'translation of dialect' is the wordplay.
'translation of' is an anagram indicator (I've seen this in other clues).
'dialect' is an anagram of 'CITADEL'.
'in' acts as a link.
(Other definitions for citadel that I've seen before include "Fortress (in or near city)" , "place of refuge" , "secure place" , "Stronghold (of the Salvation Army?)" , "Keep - castle" .)