Sauce boat lifted (7)
I believe the answer is:
ketchup
'sauce' is the definition.
(ketchup is a type of sauce)
'boat lifted' is the wordplay.
'boat' becomes 'ketch' (ketch is a kind of sailing vessel).
'lifted' becomes 'up' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ketch'+'up'='KETCHUP'
Can you help me to learn more?
(Other definitions for ketchup that I've seen before include "Red sauce" , "Spicy tomato sauce" , "Thick sauce, with tomatoes" , "Condiment" , "Relish" .)