Schoolbag (7)
I believe the answer is:
satchel
'schoolbag' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for satchel that I've seen before include "Text mark for an insertion" , "Schoolbag found in chalets" , "Get school item" , "Carrier for school books" , "Schoolbag for children's books" .)