Rebuilt citadel, in a manner of speaking (7)
I believe the answer is:
dialect
'in a manner of speaking' is the definition.
(I've seen this before)
'rebuilt citadel' is the wordplay.
'rebuilt' is an anagram indicator.
'citadel' is an anagram of 'DIALECT'.
(Other definitions for dialect that I've seen before include "Local idiom" , "Regional form of speech" , "Local language variant" , "Local way of speaking" , "talk from the regions" .)