Crossword Genius

Insect heard to run away fast (4)

Ross

I believe the answer is:

flea

I'm a little stuck... Click here to teach me more about this clue!

'insect' is the definition.
(I know that flea is a type of insect)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for flea that I've seen before include "Small blood-sucking insect" , "Bug" , "irritant type" , "Little jumping insect" , "Bloodsucking parasite" .)

I've seen this clue in the Sydney Morning Herald.
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