Doctor sees him as slow to get angry (7)
I believe the answer is:
patient
'doctor sees him as slow to get angry' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'doctor sees him' is the wordplay.
I cannot quite understand how this works, but
'him' could be 'pat' and 'pat' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for patient that I've seen before include "Cool" , "Enduring trying circumstances with an even temper" , "case for treatment" , "sick person" , "Forbearing" .)