Bird on a Canadian coin (4)
I believe the answer is:
loon
'bird on a canadian coin' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for loon that I've seen before include "Silly person (colloq.)" , "N American diving bird" , "US bird is also a silly person?" , "Fool" , "Noddy" .)