Marley was one coming in for a start (5)
I believe the answer is:
rasta
'marley was one' is the definition.
(I've seen this in another clue)
'in for a start' is the wordplay.
'in' indicates the answer is hidden within the clue.
'RASTA' is hidden in the letters of 'for a start'.
'coming' is the link.
(Other definitions for rasta that I've seen before include "Jamaican cult member" , "Member of WI religion" , "Black man" , "Dreadlocked person (abbr.)" , "Member of a religious movement with Jamaican origins" .)