Choose to have spoken of those eligible to vote (9)
I believe the answer is:
electoral
'those eligible to vote' is the definition.
I can't judge whether this defines the answer.
'choose to have spoken' is the wordplay.
'choose' becomes 'elect' (electing is a kind of choosing).
'to have' is a charade indicator (letters next to each other).
'spoken' becomes 'oral' (similar in meaning).
'elect'+'oral'='ELECTORAL'
'of' is the link.
Can you help me to learn more?
(Other definitions for electoral that I've seen before include "one kind of college" , "Like sort of college" , "Relating to polls" , "Regarding choices" , "List of voters" .)