Might he rush ahead with an operation? (7)
I believe the answer is:
surgeon
'might 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.
'might he rush ahead' is the wordplay.
I cannot quite see how this works, but
'rush' could be 'surge' (synonyms) and 'surge' is found in the answer.
'ahead' could be 'on' (synonyms) and 'on' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for surgeon that I've seen before include "Physician" , "Naval doctor" , "Medical man" , "Operating medical practitioner" , "Operating medic" .)