Crossword Genius

Insect doing backflips in rectangles (4)

Ross

I believe the answer is:

gnat

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'insect' is the definition.
(gnat is a kind of insect)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for gnat that I've seen before include "Tiny thing" , "Small biter" , "insect's" , "mozzie" , "little irritation" .)

I've seen this clue in The Hindu.
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