Loser messing around with vote is former president (9)
I believe the answer is:
roosevelt
'former president' is the definition.
(I've seen this before)
'loser messing around with vote' is the wordplay.
'messing around with' indicates an anagram.
'loser' anagrammed with 'vote' can make 'ROOSEVELT'.
'is' acts as a link.
(Other definitions for roosevelt that I've seen before include "Leading statesman in war" , "32nd US president, Franklin" , "Old president" , "Surname of 26th and 32nd US presidents" , "former president" .)