Staple diet (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
bread
'staple diet' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bread that I've seen before include "Eg, pumpernickel" , "Staple food" , "Dosh - a bloomer, perhaps?" , "rhino" , "Loaves" .)