Leaves a couple of books impounded? (7)
I believe the answer is:
cabbage
'leaves' is the definition.
(leafy vegetable)
'a couple of books impounded?' is the wordplay.
I cannot quite see how this works, but
'a' is present in the answer.
'books' could be 'bb' (two abbreviations for book) and 'bb' is found in the answer.
The remaining letters 'cage' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for cabbage that I've seen before include "Variety of brassica" , "A Brassica plant" , "Main ingredient of sauerkraut" , "Veg" , "Beg a cab to take the vegetable" .)