Place of bustle in hall, wild, time briefly to be included (7)
I believe the answer is:
anthill
'place of bustle' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'in hall wild time briefly to be included' is the wordplay.
'wild' is an anagram indicator.
'time briefly' becomes 't' (abbreviation; 'briefly' asks for a short form).
'to be included' is an insertion indicator.
'in'+'hall'='inhall'
'inhall' anagrammed gives 'anhill'.
'anhill' enclosing 't' is 'ANTHILL'.
Can you help me to learn more?
(Other definitions for anthill that I've seen before include "Home for social workers?" , "Mountain (of insects)" , "Many a worker here" , "Scene of great activity" , "Nest" .)