Flavouring what to tow? (7)
I believe the answer is:
caraway
'flavouring' is the definition.
(caraway is a kind of flavouring)
I cannot understand how the rest of the clue works.
(Other definitions for caraway that I've seen before include "Oil taken from it" , "Seed used as flavouring" , "Seeds used for flavouring" , "Umbelliferous plant" , "____ seeds, for cooking" .)