One well-known for his relations? (11)
I believe the answer is:
storyteller
'one well-known for his relations?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'for his relations?' is the wordplay.
I cannot really understand how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for storyteller that I've seen before include "novelist?" , "Narrator (possibly a liar?)" , "Relater of tales; liar" , "he retails pork pies" , "Dishonest retailer" .)