Crossword Genius

Spider discovered spinning inner web below plant bug (9)

Ross

I believe the answer is:

millipede

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'spider' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for millipede that I've seen before include "Bug" , "Many-legged creature" .)

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