Tear into animal enclosure like a tiger (6)
I believe the answer is:
stripy
'like a tiger' is the definition.
(tigers have stripes)
'tear into animal enclosure' is the wordplay.
'tear' becomes 'rip' (ripping is a kind of tearing).
'into' is an insertion indicator.
'animal enclosure' becomes 'sty' (pig sty).
'rip' going inside 'sty' is 'STRIPY'.
(Other definitions for stripy that I've seen before include "Like many blazers" , "Marked with lines" .)