He stands, wishing to sit (9)
I believe the answer is:
candidate
'he stands wishing to sit' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is all the clue.
Can you help me to learn more?
(Other definitions for candidate that I've seen before include "Campaigner" , "runner" , "Applicant; examinee" , "One standing for office" , "One hoping to be chosen" .)