Does he go ahead with hesitation? (6)
I believe the answer is:
leader
'does he' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'go ahead with hesitation?' is the wordplay.
'go ahead' becomes 'lead' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'hesitation?' becomes 'er' (sound made while hesitating - um, er).
'lead'+'er'='LEADER'
Can you help me to learn more?
(Other definitions for leader that I've seen before include "Main editorial in a newspaper" , "Principal player in an orchestra" , "The one in charge of others" , "Pioneer" , "One is ahead and shows the way" .)