Wiping up sauce boat (5)
I believe the answer is:
ketch
'boat' is the definition.
(ketch is a kind of sailing vessel)
'wiping up sauce' is the wordplay.
'wiping' is a deletion indicator.
'sauce' becomes 'ketchup' (ketchup is a type of sauce).
'ketchup' with 'up' removed is 'KETCH'.
(Other definitions for ketch that I've seen before include "Small two-master sailing vessel" , "2-masted boat" , "Jack" , "The craft" , "Two-masted sailing vessel" .)