Foolish people, riding donkeys? (5)
I believe the answer is:
asses
This might be a double definition.
'foolish people' is the first definition.
(ass can mean a foolish person)
'riding donkeys?' is the second definition.
'asses' can be an answer for 'donkeys?' (an ass is a donkey). I'm not certain of the 'riding' bit.
Can you help me to learn more?
(Other definitions for asses that I've seen before include "Fools; animals" , "Jennets" , "Hardy and sure-footed animals" , "Idiots" , "Pompous fools" .)