Does he rush ahead with an operation? (7)
I believe the answer is:
surgeon
'does he rush ahead with an operation?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'does he rush ahead' is the wordplay.
I cannot quite see how this works, but
'rush' could be 'surge' (synonyms) and 'surge' is found within the answer.
'ahead' could be 'on' (synonyms) and 'on' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for surgeon that I've seen before include "Medical knife wielder" , "Medical operator" , "Performer of operations" , "Man with knife" , "Naval medic" .)