Earth turned rapidly, we hear (5)
I believe the answer is:
world
'earth' is the definition.
(synonyms)
'turned rapidly we hear' is the wordplay.
'turned rapidly' becomes 'whirled' (I've seen this before).
'we hear' indicates a 'sounds like' (homophone) clue.
'whirled' is a homophone of 'WORLD'.
(Other definitions for world that I've seen before include "Symphony with 1a [NEW]" , "Everyone" , "Planet like the 7 down" , "Planet like the earth" , "we're happy to be on top of" .)