Show no thanks or fondness of feeling (9)
I believe the answer is:
affection
'feeling' is the definition.
(affection is a kind of feeling)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for affection that I've seen before include "Warm regard" , "Goodwill" , "Feeling of love or strong liking" , "Fondness, tenderness" , "Feeling of fondness" .)