His entry into country provides voting qualification (9)
I believe the answer is:
franchise
'voting qualification' is the definition.
'franchise' can be an answer for 'voting' (thesaurus). I'm not certain of the 'qualification' bit.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for franchise that I've seen before include "suffrage" , "For citizen, right" , "rights of citizenship" , "Authorisation to sell a company's goods or services in a specified area" , "permit being provided" .)