In endless torment, he contrives to give advice (6)
I believe the answer is:
mentor
'in endless torment he contrives' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'to give advice' is the wordplay.
I cannot really see how this works, but
'to' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for mentor that I've seen before include "One who steers" , "No term for instructor" , "He advises" , "A trusted advisor or teacher" , "A wise and experienced teacher" .)