Two-masted sailing vessel (5)
I believe the answer is:
ketch
'two-masted sailing vessel' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ketch that I've seen before include "Small two-master sailing vessel" , "Two-masted sailing ship" , "Two-masted sailing boat" , "2-masted boat" , "The craft" .)