Semiaquatic snake in Canada? No! (8)

I believe the answer is:

anaconda

I'm a little stuck... Click here to teach me more about this clue!

'semiaquatic snake' is the definition.
'anaconda' can be an answer for 'snake' (anaconda is a kind of snake). I am unsure of the 'semiaquatic' bit.

'canada? no' is the wordplay.
'canada? no' anagrams to 'ANACONDA'.
But, I am unsure how the anagram is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for anaconda that I've seen before include "Large South America snake" , "It can constrict" , "cold-blooded killer" , "Large South American snake" , "Water-boa" .)

I've seen this clue in the Sydney Morning Herald.

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