Money for a staple (5)
I believe the answer is:
bread
I believe this is a double definition.
'money' is the first definition.
(bread is slang for money)
'staple' is the second definition.
(I know that bread is a type of staple)
'for a' acts as a link.
(Other definitions for bread that I've seen before include "''Eaten . . . . . is soon forgotte''" , "Baked food; money" , "Money (inf)" , "Eg, loaf or rolls" , "brass" .)