A spider needs a site for it (3)

I believe the answer is:

web

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'a spider' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Maybe there's a link between them I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for web that I've seen before include "Network (maybe worldwide?)" , "Insect trap" , "Spider's snare" , "The world wide one of the Internet" , "A spider's mesh (3)" .)

I've seen this clue in the Evening Standard.

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