After fiddling dad, our uncle is in disgrace (5,1,5)
I believe the answer is:
under a cloud
'in disgrace' is the definition.
(I've seen this in another clue)
'after fiddling dad our uncle' is the wordplay.
'after fiddling' indicates an anagram.
'dad'+'our'+'uncle'='dadouruncle'
'dadouruncle' anagrammed gives 'UNDER A CLOUD'.
'is' is the link.
(Other definitions for under a cloud that I've seen before include "In disgrace or disfavour" , "Discredited" , "Place for cats and dogs together" , "considered suspect" , "waiting for cats and dogs?" .)