Crossword Genius

Teachers' paperback collection (3)

Ross

I believe the answer is:

set

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'teachers' paperback' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

'collection' is the second definition.
(I know that set is a type of collection)

Can you help me to learn more?

(Other definitions for set that I've seen before include "Group of items of the same kind" , "Customary < scenery < a TV < series" , "Series of tennis games" , "Put down the group of games" , "Become fixed or solid" .)

I've seen this clue in The Guardian.
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