Not very clean food to hand (6)
I believe the answer is:
grubby
'not very clean' is the definition.
(grubby means dirty or grimey)
'food to hand' is the wordplay.
'food' becomes 'grub' (grub is a kind of food).
'to hand' becomes 'by' (to hand can mean near by).
'grub'+'by'='GRUBBY'
(Other definitions for grubby that I've seen before include "Dirty or unwashed, as urchin may be" , "Dirty, could do with with a wash" , "Soiled" , "Dirty, grimy" , "Squalid" .)