Mark goes to Los Angeles with a sailor (6)
I believe the answer is:
lascar
'sailor' is the definition.
(I know that Lascar is a type of sailor)
'mark goes to los angeles' is the wordplay.
'mark' becomes 'scar' (mark left by an injury).
'goes to' is a charade indicator (letters next to each other).
'los angeles' becomes 'LA' (abbreviation).
'scar' put after 'la' is 'LASCAR'.
'with a' is the link.
(Other definitions for lascar that I've seen before include "Asian sailor" , "E. Indian seaman" , "The East Indian sailor is a rascal" , "Sailor from overseas" , "Camp-follower" .)