Remain working with right sailor (7)
I believe the answer is:
mariner
'sailor' is the definition.
(mariner means a sailor)
'remain working with right' is the wordplay.
'working with' indicates an anagram (working with the letters).
'right' becomes 'r' (abbreviation).
'remain' with letters rearranged gives 'marine'.
'marine'+'r'='MARINER'
(Other definitions for mariner that I've seen before include "Sea dog" , "Sailor" , "'''The Rime of the Ancient ...'' (Coleridge) (7)'" , "Man of the sea" , "Seaman" .)