Roman Emperor seizes drinking venue, hearing disorder (8)
I believe the answer is:
tinnitus
'hearing disorder' is the definition.
(tinnitus causes a ringing noise in the ears)
'roman emperor seizes drinking venue' is the wordplay.
'roman emperor' becomes 'titus' (Roman emperor 79 - 81 AD).
'seizes' indicates putting letters inside.
'drinking venue' becomes 'inn' (an inn is a drinking establishment).
'titus' placed around 'inn' is 'TINNITUS'.
(Other definitions for tinnitus that I've seen before include "sensational complaint" , "annoyance to the ear" , "Unpleasant noise" , "Condition in which there is constant ringing in the ears" , "Constant ringing noise in the ears" .)