Pay off Roman retinue (12)
I believe the answer is:
remuneration
'pay' is the definition.
('remuneration' can be a synonym of 'pay')
'off roman retinue' is the wordplay.
'off' indicates an anagram.
'roman'+'retinue'='romanretinue'
'romanretinue' is an anagram of 'REMUNERATION'.
(Other definitions for remuneration that I've seen before include "Money as reward" , "Pay - our men earn it (anag)" , "Money paid for work or a service" , "Payment - a minor tenure (anag)" .)