Best time to get down? (7)
I believe the answer is:
plumage
'down?' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'best time' is the wordplay.
'best' becomes 'plum' (informal term for best or top-class).
'time' becomes 'age' (an age is a period of time).
'plum'+'age'='PLUMAGE'
'to get' acts as a link.
Can you help me to learn more?
(Other definitions for plumage that I've seen before include "A bird's feathers, may be fancy" , "coat" , "Bird's covering of feathers" , "Birds' clothing" , "Cover for diver" .)