Cuckoo with intention of feeding? (3,2,5)
I believe the answer is:
out to lunch
I'm afraid I can't explain this answer.
Can you help me to learn more?
(Other definitions for out to lunch that I've seen before include "Temporarily removed from office" , "Sign on shopkeeper's door" , "Slightly crazy - not eating in" , "stupid" , "unbalanced" .)