Land in part of Cambodia (5)
I believe the answer is:
india
'land' is the definition.
(India is an example)
'part of cambodia' is the wordplay.
'part of' becomes 'in' (I've seen this in other clues).
'cambodia' becomes 'dia' (I can't explain this - if you can you should give a lot more credence to this answer).
'in'+'dia'='INDIA'
'in' is the link.
Can you help me to learn more?
(Other definitions for india that I've seen before include "Commonwealth country, independent in 1947" , "Second-most populous country" , "Eastern country" , "Cricket team" , "Bollywood's country" .)