Devourer of knowledge (8)

I believe the answer is:

bookworm

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

This is all the clue.

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(Other definitions for bookworm that I've seen before include "One devoted to reading" , "Incessant reader" , "One who loves reading" , "One spends a lot of time reading" , "An avid reader or a kind of grub" .)

I've seen this clue in The Globe and Mail and The Telegraph.

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