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Core (6)

Ross

'core' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for nubbin that I've seen before include "Something small or undeveloped as of corn ear" , "small lump" , "Little lump" .)

I've seen this clue in The Guardian, the Newsday, the Penny Press, The Mirror, The Telegraph, the Evening Standard and The Sun.
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