Sailor is sorry after fall from grace (6)
I believe the answer is:
sinbad
'sailor' is the definition.
(I've seen this before)
'sorry after fall from grace' is the wordplay.
'sorry' becomes 'bad' (similar in meaning).
'after' means one lot of letters go next to another.
'fall from grace' becomes 'sin' (I've seen this before).
'bad' after 'sin' is 'SINBAD'.
'is' acts as a link.
(Other definitions for sinbad that I've seen before include "The 1001 Nights sailor" , "Legendary sailor from Arabian nights" , "Adventurous sailor of Arabian Nights or pantomime" , "Literary sailor" , "Legendary mariner noted for seven voyages" .)