Crossword Genius

Fundamental (6)

Ross

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

This is all the clue.

(Other definitions for staple that I've seen before include "(Of food) necessary and important" , "Paper fastener - basic foodstuff" , "security device" , "means of keeping papers together" , "Paper pin for plates" .)

I've seen this clue in The Guardian, The New York Times, The Sun and the Evening Standard.
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