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Recorded soprano can reach this open water (4,3)

Ross

I believe the answer is:

high sea

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

'water' is the definition.
(high sea is a kind of water)

'recorded soprano can reach this open' is the wordplay.
I cannot really understand how this works, but
'soprano' could be 'high' (similar in meaning) and 'high' is found in the answer.
The remaining letters 'sea' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

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