Imprisons (5)
I believe the answer is:
cages
'imprisons' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cages that I've seen before include "Locks up" , "Enclosures for animals" , "Wild animal enclosures" , "prisons" , "Enclosures made or wire or metal bars" .)