Somewhere in Canada they prohibit two French leaders (5)
I believe the answer is:
banff
'somewhere in canada they' is the definition.
Although both the answer and 'they' are nouns, they are not in the same form of the noun.
'prohibit two french leaders' is the wordplay.
'prohibit' becomes 'ban' (banning is a kind of prohibiting).
'two' says to double the letters.
'leaders' suggests taking the first letters.
The first letter of 'french' is 'f'.
'f' duplicated is 'ff'.
'ban'+'ff'='BANFF'
Can you help me to learn more?
(Other definitions for banff that I've seen before include "N. Aberdeenshire town" , "Scottish region" , "Historic county town in Grampian" , "Town (and old county) in Aberdeenshire" , "Scots town" .)