Altering ode, man complained (6)
I believe the answer is:
moaned
'complained' is the definition.
(I've seen this in another clue)
'altering ode man' is the wordplay.
'altering' is an anagram indicator.
'ode'+'man'='odeman'
'odeman' is an anagram of 'MOANED'.
(Other definitions for moaned that I've seen before include "Complained" , "Made low sound of pain - or grumbled" , "Made low sound of pain or distress" , "A demon (anag.)" , "Made low mournful sound as of pain" .)