Charity some Canadians backed (3)
I believe the answer is:
aid
'charity' is the definition.
(eg foreign aid)
'some canadians backed' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'backed' is a reversal indicator.
'dia' is hidden within 'canadians'.
'dia' back-to-front is 'AID'.
(Other definitions for aid that I've seen before include "Relief" , "Care, assistance" , "charity" , "Help, assistance" , "Care and help" .)