My aircon is busted, leading to ill feeling (8)
I believe the answer is:
acrimony
'ill feeling' is the definition.
'my aircon is busted' is the wordplay.
'is busted' indicates anagramming the letters.
'my'+'aircon'='myaircon'
'myaircon' with letters rearranged gives 'ACRIMONY'.
'leading to' is the link.
(Other definitions for acrimony that I've seen before include "'Bitterness, sharpness (8)'" , "I cry, moan (anag)" , "Acronym I construct with bitter words" , "Acronym I made out of bitterness" , "Bitterness, ill feeling" .)