Complaint as yours truly organised sales (7)
I believe the answer is:
measles
'complaint' is the definition.
(measles is a kind of disease)
'yours truly organised sales' is the wordplay.
'yours truly' becomes 'me'.
'organised' indicates anagramming the letters.
'sales' with letters rearranged gives 'asles'.
'me'+'asles'='MEASLES'
'as' is the link.
(Other definitions for measles that I've seen before include "Morbilli is technical term for this illness" , "Ailment" , "Contagious disease in children" , "Childhood viral disease" , "I appear as 8 [RASH]" .)