China broken in sequence (5)
I believe the answer is:
chain
'sequence' is the definition.
(I've seen this before)
'china broken' is the wordplay.
'broken' indicates an anagram.
'china' is an anagram of 'CHAIN'.
'in' acts as a link.
(Other definitions for chain that I've seen before include "Length of pitch" , "Mountain range" , "Series of things linked together" , "several supermarkets" , "Part of cycle" .)