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