Nag's nosh (3)
I believe the answer is:
hay
'nag's nosh' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hay that I've seen before include "Dried grass as fodder" , "Cut and dried grass" , "basic bedding" , "Make . . . while the sun shines" , "Animal fodder" .)