Vote to exclude leader's share (5)
I believe the answer is:
'share' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for allot that I've seen before include "Dispense or distribute" , "Award (share, task)" , "Dish out" , "Earmark" , "Apportion, share" .)