Fellow sailor finds the map is wrong (8)
I believe the answer is:
shipmate
'fellow sailor' is the definition.
(I've seen this before)
'the map is wrong' is the wordplay.
'wrong' indicates anagramming the letters.
'the'+'map'+'is'='themapis'
'themapis' anagrammed gives 'SHIPMATE'.
'finds' is the link.
(Other definitions for shipmate that I've seen before include "Fellow sailor" , "Sailor on board, a real pal" , "Friend on board" , "Fellow crew member" , "Fellow crewman" .)