The case for schoolbooks (7)

I believe the answer is:

satchel

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

I can't explain the rest of the clue.

(Other definitions for satchel that I've seen before include "Bag -- latches (anag)" , "Schoolbag found in chalets" , "Get school item" , "Schoolbag for children's books" , "Small case with a shoulder strap" .)

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

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