Collapsed, due to failing after adverse criticism (6,3)

'collapsed' is the definition.
(to flake out is to collapse or become very tired)

'due to failing after adverse criticism' is the wordplay.
'failing' indicates anagramming the letters (a failed spelling of the word).
'after' says to put letters next to each other.
'adverse criticism' becomes 'flak' (flak can mean strong criticism).
'due'+'to'='dueto'
'dueto' with letters rearranged gives 'edout'.
'edout' put after 'flak' is 'FLAKED OUT'.