Golden Fleece craft (4)
I believe the answer is:
argo
'golden fleece craft' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for argo that I've seen before include "Old ship" , "Ship used by Jason in his search for the Golden Fleece" , "Jason's vessel" , "Stars once recognised in the south" , "Mythical ship" .)