Ship partition (8)
I believe the answer is:
bulkhead
'ship partition' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bulkhead that I've seen before include "Upright partition in ship or aircraft" , "Separating wall in ship" , "Separator in ship" , "piece of partitioning" , "Interior partition in a ship or aircraft" .)