Equestrian male carried by roan he's broken? (8)
I believe the answer is:
horseman
'equestrian' is the definition.
('horseman' can be a synonym of 'equestrian')
'male carried by roan he's broken?' is the wordplay.
'male' becomes 'm' (common abbreviation).
'carried by' is an insertion indicator.
'broken?' indicates an anagram.
'roan'+'hes'='roanhes'
'roanhes' with letters rearranged gives 'horsean'.
'm' put into 'horsean' is 'HORSEMAN'.
(Other definitions for horseman that I've seen before include "mounted rider" , "(Skilled) rider" , "Equestrian" , "Jockey" , "Male rider" .)