Crossword Genius

Source (4)

Ross

There are a few possibilities for this:

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4

6 4*

'source' is the definition.
(both can mean the origin of something)

This is the entire clue.

(Other definitions for root that I've seen before include "Turn up with the snout." , "Origin; eg, carrot" , "Rhizome" , "Rummage, origin" , "Lowest part of plant" .)

I've seen this clue in the Penny Press, the Evening Standard, The Star Tribune, The Telegraph, The Mirror, the USA Today and The New York Times.
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