He makes one cross at times (7)
I believe the answer is:
elector
'he makes one cross at times' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is the entire clue.
Can you help me to learn more?
(Other definitions for elector that I've seen before include "A prince of the Holy Roman Empire" , "One eligible to vote" , "he chooses" , "One has a legal right to vote" , "One may make one cross" .)