Am silent about complaints (8)
I believe the answer is:
ailments
'complaints' is the definition.
('ailment' can be a synonym of 'complaint')
'am silent about' is the wordplay.
'about' indicates anagramming the letters.
'am'+'silent'='amsilent'
'amsilent' anagrammed gives 'AILMENTS'.
(Other definitions for ailments that I've seen before include "Diseases or disorders" , "Illnesses, complaints" , "Minor illnesses" , "Maladies of manliest sort" , "Nail stem produces illnesses" .)