They may provide support for librarians (8)

I believe the answer is:

bookends

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'they' is the definition.
Both the definition and answer are plural nouns.
Maybe you can see an association between them that I can't see?

'support for librarians' is the wordplay.
'support' becomes 'bookend' (bookend is a kind of support).
'for librarians' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'bookend'+'s'='BOOKENDS'

'may provide' acts as a link.

Can you help me to learn more?

(Another definition for bookends that I've seen is " Props for volumes".)

I've seen this clue in The Times.

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