School in south-east China (5)
I believe the answer is:
spode
'china' is the definition.
(I've seen this before)
'school in south-east' is the wordplay.
'school' becomes 'pod' (term for a group of marine mammals).
'in' indicates putting letters inside.
'south east' becomes 'SE' (abbreviation).
'pod' going within 'se' is 'SPODE'.
(Other definitions for spode that I've seen before include "English potter" , "English porcelain manufacturer" , "Pottery manufacturer" , "Brand of china" , "Brand of fine English porcelain" .)