Male King's schoolteacher provides delicious food (5)
I believe the answer is:
manna
'delicious food' is the definition.
(I've seen this before)
'male king's schoolteacher' is the wordplay.
'male' becomes 'man' (man is a kind of male).
'king's schoolteacher' becomes 'na' (I can't justify this - if you can you should give a lot more credence to this answer).
'man'+'na'='MANNA'
'provides' acts as a link.
Can you help me to learn more?
(Other definitions for manna that I've seen before include "Spiritual nourishment" , "Heavenly nourishment" , "Godsend" , "Food provided by God for the Israelites in the wilderness" , "Divine nourishment" .)