Understand there's no time for one from Canada (5)
I believe the answer is:
inuit
'understand there's no' is the definition.
I can't tell whether this defines the answer.
'time for one from canada' is the wordplay.
'time' becomes 't' (abbreviation).
'for' means one lot of letters go next to another (I've seen this in other clues).
'one' becomes 'i' (Roman numeral).
'from' is a charade indicator (letters next to each other).
'canada' becomes 'nui' (I can't justify this - if you can you should give a lot more credence to this answer).
'i'+'nui'='inui'
't' after 'inui' is 'INUIT'.
Can you help me to learn more?
(Other definitions for inuit that I've seen before include "short stay in Paris hotel?" , "Eskimos" , "Alternative spelling for the Eskimo people" , "A North American eskimo" , "Dwellers in the furthest north of America" .)