Really dumb (7)
(Other definitions for asinine that I've seen before include "Stupid (as a donkey?)" , "Is inane to be foolish" , "Daft" , "simple" , "Senseless" .)
'really dumb' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for moronic that I've seen before include "ROM coin (anag.)" , "Foolish" , "Mindless" , "really stupid" , "Omicron (anag) - stupid" .)