Crossword Genius

Schoolboy's book case (7)

Ross

I believe the answer is:

satchel

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

This clue might be a double definition.

'schoolboy's book' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'case' is the second definition.
(satchel is a kind of case)

Can you help me to learn more?

(Other definitions for satchel that I've seen before include "What's carried by pupils" , "Carrier for school books" , "Bag for school books" , "Bag with a flap and strap" , "Small case with a shoulder strap" .)

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