Crossword Genius

Returning from Niagara, as before (5)

Ross

I believe the answer is:

again

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'before' is the definition.
Both the definition and answer are adverbs. Perhaps there's an association between them I don't understand?

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

'as' acts as a link.

Can you help me to learn more?

(Other definitions for again that I've seen before include "Not for the first time" , "second term" , "Here we go ___" , "Ocne more" , "'Another time, once more (5)'" .)

I've seen this clue in the Evening Standard.
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