Doctor sees chap denying "that hurt" (4)
I believe the answer is:
fell
'doctor' is the definition.
(I have seen 'unloveable doctor' mean 'fell' so perhaps 'doctor' could also mean 'fell')
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for fell that I've seen before include "Knock down - or was knocked down?" , "stretch of moorland" , "yielded to attack" , "Brutal -- high moorland" , "Mountain - lost footing - deadly" .)