Oars(wo)man (5)
I believe the answer is:
rower
'oarswoman' is the definition.
(I know that oarswoman can be written as rower)
This is all the clue.
(Other definitions for rower that I've seen before include "Waterman" , "Sportsperson" , "One who argues" , "Person using 9" , "crew member, perhaps" .)