Insane, very stupid or just soft-hearted (4,2,1,5)
I believe the answer is:
daft as a brush
(Other definitions for daft as a brush that I've seen before include "Insane or very stupid (ii)" , "Utterly silly" .)
I've seen this clue in The Guardian.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.