Treat the new potatoes to a little butter? (6)
I believe the answer is:
scrape
This could be a double definition.
'treat the new potatoes' is the first definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'little butter?' is the second definition.
The definition and answer can be both to do with contact as well as being verbs in their base form.
Perhaps there's an association between them I don't understand?
'to a' acts as a link.
Can you help me to learn more?
(Other definitions for scrape that I've seen before include "Use last remaining resource - . . . . . . the barrel" , "Save as much as possible" , "Bark" , "Graze - awkward predicament" , "Awkward situation caused by capers" .)