Another failure on board for ship's officer (6,4)
I believe the answer is:
second mate
'ship's officer' is the definition.
(another term for the second officer of a ship)
'another failure on board' is the wordplay.
'another' becomes 'second'.
'failure on board' becomes 'mate' (as in checkmate in chess - the mated player loses).
'second'+'mate'='SECOND MATE'
'for' is the link.
(Other definitions for second mate that I've seen before include "one involved in bigamy?" , "Naval officer" , "Craftsman, perhaps" .)