Power of right in vote for one town (11)
I believe the answer is:
electricity
'power' is the definition.
(electricity is a kind of power)
'right in vote for one town' is the wordplay.
'right' becomes 'r' (common abbreviation).
'in' indicates putting letters inside.
'vote for' becomes 'elect' (I've seen this before).
'one' becomes 'i' (Roman numeral).
'town' becomes 'city' (I've seen this in other clues**).
'elect'+'i'='electi'
'r' inserted within 'electi' is 'electri'.
'electri'+'city'='ELECTRICITY'
'of' acts as a link.
(Other definitions for electricity that I've seen before include "Energy associated with charged particles" , "Current supplier" , "Source of light and power" , "Domestic energy supply" , "One form of energy" .)