Crossword Genius

Start again with a newer system (5)

Ross

I believe the answer is:

renew

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'start again' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for renew that I've seen before include "Extend eg library loan" , "Extend (subscription)" , "Restore, resume" , "Renovate" , "what regeneration will do" .)

I've seen this clue in the Evening Standard.
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