Ship's crew in endless ocean run (7)
I believe the answer is:
steamer
'ship's' is the definition.
(steamer is a kind of ship)
'crew in endless ocean run' is the wordplay.
'crew' becomes 'team' (I've seen this before**).
'in' is an insertion indicator.
'endless' means to remove the last letter.
'ocean' becomes 'sea' ('sea' can be a synonym of 'ocean').
'run' becomes 'r' (cricket abbreviation).
'sea' with its last letter removed is 'se'.
'team' placed inside 'se' is 'steame'.
'steame'+'r'='STEAMER'
(Other definitions for steamer that I've seen before include "Large vessel - cooking vessel" , "Kitchen pan; ship" , "Wetsuit" , "found in the kitchen" , "One heats up" .)