Renegades stop at sea perhaps (9)
I believe the answer is:
apostates
'renegades' is the definition.
('apostate' can be a synonym of 'renegade')
'stop at sea perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'stop'+'at'+'sea'='stopatsea'
'stopatsea' is an anagram of 'APOSTATES'.
(Other definitions for apostates that I've seen before include "Those who renounce a belief" , "People who have renounced former beliefs" .)