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Where to find alternating current (5,5)

Ross

I believe the answer is:

tidal river

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'where to' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'alternating current' is the wordplay.
'alternating' becomes 'tidal' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'current' becomes 'river' (I've seen this before).
'tidal'+'river'='TIDAL RIVER'

'find' is the link.

Can you help me to learn more?

(Another definition for tidal river that I've seen is " It rises and falls".)

I've seen this clue in The Globe and Mail and The Guardian.
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