Fancy craft that's most attractive (9)
I believe the answer is:
dreamboat
'most attractive' is the definition.
(I've seen this before)
'fancy craft' is the wordplay.
'fancy' becomes 'dream' (I've seen this before).
'craft' becomes 'boat' (boat is a kind of craft).
'dream'+'boat'='DREAMBOAT'
'that's' acts as a link.
(Other definitions for dreamboat that I've seen before include "Heart-throb - met abroad (anag)" , "Hunk" , "Stunner (for drifting off in?)" , "Very attractive man" , "Dishy sort" .)