More nuts (7)
'more nuts' is the definition.
('loony' can be a synonym of 'nuts')
This is all the clue.
(Another definition for loonier that I've seen is " Dafter".)
'more nuts' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for insaner that I've seen before include "Even more mad" , "Not so reasonable" , "Not so sensible" , "even more senseless" .)