Favourite uncle manipulated with a childish impatience (9)
I believe the answer is:
petulance
'childish impatience' is the definition.
The answer and definition can be both feelings as well as being singular nouns.
Maybe there's a link between them I don't understand?
'favourite uncle manipulated with a' is the wordplay.
'favourite' becomes 'pet' (synonyms).
'manipulated with' indicates an anagram.
'uncle' with its letters anagrammed with 'a' can make 'ulance'.
'pet'+'ulance'='PETULANCE'
Can you help me to learn more?
(Other definitions for petulance that I've seen before include "Peevish irritation" , "Show of temper" , "Bad temper, sulkiness" , "Childish sulkiness" , "Sulky bad behaviour" .)