Insect to dance about endlessly (4)
I believe the answer is:
gnat
'insect' is the definition.
(gnat is a kind of insect)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for gnat that I've seen before include "Small, swarming insect" , "Biting pest" , "Something with bite" , "annoying flier" , "insect's" .)