Crossword Genius

Staple food? (4)

Ross

I think it could be either:

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4

5

tack

I believe this clue is a double definition.

'staple' is the first definition.
(thesaurus)

'food?' is the second definition.
(informal term for food)

(Other definitions for tack that I've seen before include "Nail; course of action" , "Riding saddles, bridles etc" , "vulgar" , "Stable gear" , "(Of a sailing ship) alter course through the wind" .)

I've seen this clue in The Guardian, The Times, The Globe and Mail and The Telegraph.
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