Crossword Genius

Korean currency's up twofold? Steady on! (3,3)

Ross

I believe the answer is:

now now

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

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

'korean currency's up twofold? steady' is the wordplay.
'korean currency' becomes 'won' (I've seen this in another clue).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'twofold? steady' becomes 'now' (I can't justify this - if you can you should give a lot more credence to this answer).
'won' back-to-front is 'now'.
'now'+'now'='NOW NOW'

Can you help me to learn more?

(Other definitions for now now that I've seen before include "It's said to reprimand or pacify a person" , "Warning" , "stop bickering" , "said to calm one down" .)

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