Burst into pig pen like a tiger, for example (6)
I believe the answer is:
stripy
'like a tiger for example' is the definition.
(tigers have stripes)
'burst into pig pen' is the wordplay.
'burst' becomes 'rip' (both can mean to split or tear).
'into' is an insertion indicator.
'pig pen' becomes 'sty' (where pigs are kept).
'rip' placed into 'sty' is 'STRIPY'.
(Other definitions for stripy that I've seen before include "Marked with lines" , "Like many blazers" .)