A berry high mountain in Canada! (5)
I believe the answer is:
logan
'in canada' is the definition.
('Logan' is part of 'canada')
'a berry high mountain' is the wordplay.
I cannot really see how this works, but
'a' could be 'an' and 'an' is located in the answer.
The remaining letters 'log' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for logan that I've seen before include "Mount ..... is the highest peak in Canada" , "Rocking stone" , "(Grower of) berry" , "Rocking-stone" .)