Staple food (5)
'staple food' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bread that I've seen before include "Money (inf)" , "Dosh (slang)" , "It may be made from meal" , "Staff of life" , "It's made with 23" .)
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" .)