Rogue, Ethiopian prince, still not married (6)
I believe the answer is:
rascal
'rogue' is the definition.
('rascal' can be a synonym of 'rogue')
'ethiopian prince still not married' is the wordplay.
'ethiopian prince' becomes 'ras' (I've seen this before).
'still' becomes 'calm' ('calm' can be a synonym of 'still').
'not' is a deletion indicator.
'married' becomes 'm'.
'calm' with 'm' taken out is 'cal'.
'ras'+'cal'='RASCAL'
(Other definitions for rascal that I've seen before include "A scoundrel or scamp" , "Impudent person" , "Rogue of a lascar" , "Mischievous person or confused lascar" , "Rogue, scamp" .)