Aid in developing country (5)
I believe the answer is:
india
'country' is the definition.
(India is an example)
'aid in developing' is the wordplay.
'developing' indicates anagramming the letters.
'aid'+'in'='aidin'
'aidin' is an anagram of 'INDIA'.
(Other definitions for india that I've seen before include "Comms code for I" , "Commonwealth state" , "Asian sub-continent" , "Second-most populous country" , "Place of Kipling's birth" .)