Crossword Genius

Ocean waves increase a further time (4,5)

Ross

I believe the answer is:

once again

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'ocean waves increase a further time' is the definition.
I can't tell whether this definition defines the answer.

'ocean waves increase' is the wordplay.
'waves' is an anagram indicator.
'increase' becomes 'gain' (gain is a kind of increase).
'ocean' with letters rearranged gives 'oncea'.
'oncea'+'gain'='ONCE AGAIN'

Can you help me to learn more?

(Another definition for once again that I've seen is " encore".)

I've seen this clue in The Telegraph.
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