Schoolboy's book case (7)
I believe the answer is:
satchel
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" .)