Candidate number one's last to vote (7)
I believe the answer is:
nominee
'candidate' is the definition.
(I know that candidate can be written as nominee)
'number one's last to vote' is the wordplay.
'number' becomes 'no' (abbreviation for 'number').
'one's' becomes 'mine' (I am not sure about this - if you are sure you should believe this answer much more).
'last to' suggests the final letters.
The last letter of 'vote' is 'e'.
'no'+'mine'+'e'='NOMINEE'
Can you help me to learn more?
(Other definitions for nominee that I've seen before include "One put forward as a candidate" , "Candidate for office" , "One proposed for election" , "Candidate - appointed person" , "One named as candidate" .)