Possibly relocate a missing voter (7)
I believe the answer is:
elector
'voter' is the definition.
(I know that voter can be written as elector)
'possibly relocate a missing' is the wordplay.
'possibly' is an anagram indicator.
'missing' is a deletion indicator.
'relocate' with 'a' taken out is 'relocte'.
'relocte' with letters rearranged gives 'ELECTOR'.
(Other definitions for elector that I've seen before include "Voter - old German prince" , "one given a choice" , "One has a legal right to vote" , "one with an X" , "One with the power to cross" .)