State one's trapped in the subcontinent (9)
I believe the answer is:
indonesia
'state' is the definition.
(Indonesia is an example)
'one's trapped in the subcontinent' is the wordplay.
'trapped in' means one lot of letters goes inside another.
'the subcontinent' becomes 'india' (I've seen this before).
'ones' inserted inside 'india' is 'INDONESIA'.
(Other definitions for indonesia that I've seen before include "An ionised country of South East Asia" , "somewhere in Asia" , "Asian country, capital Jakarta" , "part of Asia" , "State" .)