Moneybags lifts box office embargo (5)
I believe the answer is:
nabob
'moneybags' is the definition.
(I've seen this before)
'lifts box office embargo' is the wordplay.
'lifts' shows that the letters should be reversed in order (I've seen 'lifted' mean this (going up in down clue)).
'box office' becomes 'bo' (entertainment industry acronym).
'embargo' becomes 'ban' (I've seen this in other clues).
'bo'+'ban'='boban'
'boban' written backwards gives 'NABOB'.
(Other definitions for nabob that I've seen before include "VIP" , "Mogul governor; rich man" , "Wealthy influential person" , "Person of conspicuous wealth or high status" , "Powerful man" .)