Dispatcher of bull from Rome mostly carrying information around (7)
I believe the answer is:
matador
'dispatcher of bull' is the definition.
(someone who dispatches or kills bulls)
'rome mostly carrying information around' is the wordplay.
'mostly' means to remove the last letter.
'carrying' is an insertion indicator.
'information' becomes 'data' (data are bits of information).
'around' is a reversal indicator.
'rome' with its last letter taken away is 'rom'.
'rom' going around 'data' is 'rodatam'.
'rodatam' written backwards gives 'MATADOR'.
'from' acts as a link.
(Other definitions for matador that I've seen before include "he aims to get a bull" , "who does for bulls" , "A Spanish bullfighter" , "A bull-fighter.11 Beginning to develop" , "fighter in the ring?" .)