Party in a long foreign craft (7)
I believe the answer is:
gondola
'craft' is the definition.
(gondola is a kind of craft)
'party in a long foreign' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'in' indicates putting letters inside.
'foreign' indicates anagramming the letters (foreign order of the letters).
'a'+'long'='along'
'along' anagrammed gives 'gonla'.
'do' put into 'gonla' is 'GONDOLA'.
(Other definitions for gondola that I've seen before include "Venetian vessel" , "Venetian boat - airship car" , "Compartment suspended from an airship" , "Boats on the canals of Venice" , "Goon lad (anag.)" .)