Canadian ready to knock over everyone in bar (6)
I believe the answer is:
dollar
'canadian ready' is the definition.
(ready is an informal term for money)
'knock over everyone in bar' is the wordplay.
'knock over' shows that the letters should be reversed in order.
'everyone' becomes 'all' (I've seen this before).
'in' indicates putting letters inside.
'bar' becomes 'rod' (I've seen this in other clues**).
'all' put within 'rod' is 'rallod'.
'rallod' back-to-front is 'DOLLAR'.
'to' is the link.
(Other definitions for dollar that I've seen before include "Monetary unit in several countries" , "The almighty currency, a buck" , "Australian currency" , "Greenback; buck" , "Philip -, English poet" .)