Crossword Genius

Core (7)

Ross

'core' is the definition.
(I know that core can be written as nucleus)

This is all the clue.

(Other definitions for nucleus that I've seen before include "Central core of an atom" , "atomic centre" , "Centre of an atom" , "Central mass of a cell" , "centrepiece?" .)

I've seen this clue in The Telegraph, The Guardian, The Mirror, the Sydney Morning Herald and The Independent.
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