Supply staff with sodium and bountiful food (5)
I believe the answer is:
manna
'food' is the definition.
(I know that manna is a type of food)
'supply staff with sodium and bountiful' is the wordplay.
I cannot really understand how this works, but
'staff' could be 'man' (as in staffing or manning a particular place) and 'man' is found within the answer.
'sodium' could be 'na' (chemical symbol) and 'na' is found within the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for manna that I've seen before include "Spiritual nourishment" , "Old Testament food (from heaven?)" , "Heavenly food" , "Heavenly nourishment" , "Heavenly grub?" .)