Misuse orchestra members sent over to entertain rich man (7)
I believe the answer is:
croesus
'rich man' is the definition.
(famously rich ancient king)
'misuse orchestra members sent over to entertain' is the wordplay.
'to entertain' indicates a hidden word (I've seen 'entertains' mean this (the answer is welcomed or entertained by the clue)).
'sent over' is a reversal indicator.
'suseorc' is hidden in the letters of 'misuse orchestra members'.
'suseorc' written backwards gives 'CROESUS'.
(Other definitions for croesus that I've seen before include "Very rich person" , "Sources for legendary rich king" , "Ancient king renowned for his wealth" , "King of fabulous wealth" , "Fabled rich man" .)