Good morsels thrown out? That's stupid (8)
I believe the answer is:
gormless
'stupid' is the definition.
('gormless' can be similar in meaning to 'stupid')
'good morsels thrown out?' is the wordplay.
'good' becomes 'g' (abbreviation).
'thrown out?' indicates an anagram (I've seen 'throw out' mean this).
'morsels' with letters rearranged gives 'ormless'.
'g'+'ormless'='GORMLESS'
'that's' acts as a link.
(Other definitions for gormless that I've seen before include "Lacking initiative (informal)" , "Silly, lacking sense (colloq.)" , "Stupid (slang)" , "Lacking the sense one was born with" , "Slow" .)