Voter, English speaker (7)
I believe the answer is:
elector
'voter' is the definition.
(I know that voter can be written as elector)
'english speaker' is the wordplay.
'english' becomes 'e' (abbreviation).
'speaker' becomes 'lector' (a lector reads in a church).
'e'+'lector'='ELECTOR'
(Other definitions for elector that I've seen before include "Germanic prince" , "Constituent" , "One whom may vote" , "I choose" , "Potential voter" .)