Crossword Genius

But lots of other insects do this too (3)

Ross

I believe the answer is:

fly

'insects do this too' is the definition.
The definition suggests a singular noun which matches the answer. I also know that 'insects' relates to this answer.

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

(Other definitions for fly that I've seen before include "Soar; hurry" , "One invited into parlour" , "needs to get away" , "Flee" , "An insect; run away" .)

I've seen this clue in The Times.
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