Seaman accustomed to being reviled (6)
I believe the answer is:
abused
'being reviled' is the definition.
('abused' can be similar in meaning to 'reviled')
'seaman accustomed' is the wordplay.
'seaman' becomes 'ab'.
'accustomed' becomes 'used' (I've seen this before).
'ab'+'used'='ABUSED'
'to' is the link.
(Other definitions for abused that I've seen before include "Insulted; violated" , "Swore at" , "Reviled, or used wrongly like drugs" , "Criminally maltreated" , "Treated cruelly; insulted" .)