Sea engulfing stricken giant two-master (10)
I believe the answer is:
brigantine
'two-master' is the definition.
(I've seen this in another clue)
'sea engulfing stricken giant' is the wordplay.
'sea' becomes 'brine' (I've seen this in another clue).
'engulfing' means one lot of letters goes inside another.
'stricken' indicates an anagram (stricken can mean unwell or injured).
'giant' is an anagram of 'igant'.
'brine' enclosing 'igant' is 'BRIGANTINE'.
(Other definitions for brigantine that I've seen before include "Two-masted sailing ship" , "Boat" , "vessel" .)