A set of Tolkien's ideas (8)
I believe the answer is:
inklings
'ideas' is the definition.
(inkling is a kind of idea)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for inklings that I've seen before include "hints" , "Slinking with intimations or suspicions" , "Hings, slight suspicions" , "Intimations, slight suspicions" , "Slight suggestions, intimations" .)