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Core (6)

Ross

'core' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for staple that I've seen before include "Basic sort of plates" , "Fastening wire" , "Raw material" , "Important; paper fastener" , "Paper fastener found on plates" .)

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