Going round, it can be said to have whirled (5)
I believe the answer is:
world
This clue might be a double definition.
'going round' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'it can be said to have whirled' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for world that I've seen before include "we're happy to be on top of" , "public" , "Symphony with 1a [NEW]" , "Earth - universe" , "Sphere of activity" .)