Crossword Genius

Once more returning from Niagara (5)

Ross

I believe the answer is:

again

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'once more' is the definition.
(synonyms)

'returning from niagara' is the wordplay.
'AGAIN' is hidden backwards in amongst the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for again that I've seen before include "repeat order" , "Here we go ___" , "Predictably perhaps" , "second term" , "Not for the first time" .)

I've seen this clue in the Evening Standard.
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