Imagined misshapen gem would have been stolen from this country (5)
I believe the answer is:
india
'imagined misshapen gem would have been stolen from this country' is the definition.
'india' can be an answer for 'country' (India is an example). I am not sure about the remainder of the definition.
'from this country' is the wordplay.
'from' becomes 'in' (I've seen this in other clues).
'this country' becomes 'dia' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in'+'dia'='INDIA'
Can you help me to learn more?
(Other definitions for india that I've seen before include "Country: I (comms.)" , "Land in Asia" , "South Asian country" , "vast country" , "Queen Victoria considered it the Jewel in the Crown" .)