Stupidly eat TV dinner getting careless (11)
I believe the answer is:
inadvertent
'careless' is the definition.
(I've seen this before)
'stupidly eat tv dinner' is the wordplay.
'stupidly' is an anagram indicator.
'eat'+'tv'+'dinner'='eattvdinner'
'eattvdinner' with letters rearranged gives 'INADVERTENT'.
'getting' acts as a link.
(Other definitions for inadvertent that I've seen before include "Accidental" , "Unthinking" , "Unintentional" , "Careless" , "without meaning" .)