Moved to CID, in manner of speaking (7)
I believe the answer is:
diction
'manner of speaking' is the definition.
(I've seen this before)
'moved to cid in' is the wordplay.
'moved' indicates anagramming the letters.
'to'+'cid'+'in'='tocidin'
'tocidin' with letters rearranged gives 'DICTION'.
(Other definitions for diction that I've seen before include "One's manner of speaking or pronouncing words" , "Mode of speech" , "Style of enunciation" , "Manner of enunciation" , "Way of speaking or pronouncing" .)