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