Sailor on board ship finds celebs (5)
I believe the answer is:
stars
'celebs' is the definition.
(star can mean a famous person)
'sailor on board ship' is the wordplay.
'sailor' becomes 'tar' (slang term for a sailor).
'on board' indicates putting letters inside (inserted letters are taken on board).
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'tar' inserted within 'ss' is 'STARS'.
'finds' is the link.
(Other definitions for stars that I've seen before include "Celebs - constellation" , "Celestial bodies of hot gases" , "Leading performers (with stripes?)" , "Heavenly bodies" , "plays a leading role" .)