A colonist in a Canadian town (3)
I believe the answer is:
'a colonist' is the definition.
(ants live in colonies)
'in a canadian town' is the wordplay.
'in' indicates a hidden word.
'ANT' is hidden in the letters of 'canadian town'.
(Other definitions for ant that I've seen before include "Emmet or pismire" , "Proverbially hard-working insect" , "One more provident than Grasshopper" , "Member of colony" , "Hill-dweller" .)