George's rival appears to be tedious (6)
I believe the answer is:
dragon
'george's rival' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'to be tedious' is the wordplay.
I cannot really understand how this works, but
'be' could be 'go' (going is a kind of being) and 'go' is located in the answer.
This may be the basis of clue (or it may be nonsense).
'appears' acts as a link.
Can you help me to learn more?
(Other definitions for dragon that I've seen before include "Reptilian monster" , "Fire-breathing, winged mythical monster" , "See 7" , "Intractable person" , "Fire-breathing creature of myth" .)