Do what chickens do with old soap? (10)
I believe the answer is:
crossroads
'do' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
I can't explain the remainder of the clue.
(Other definitions for crossroads that I've seen before include "Meeting of ways" , "critical situation?" , "Intersection of ways" , "Soap once" .)