Duck, left out for meal (3)
I believe the answer is:
tea
'meal' is the definition.
(tea is a kind of meal)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for tea that I've seen before include "Earl Grey?" , "Plant" , "Sort of garden, chest or service" , "Afternoon meal (3)" , "A light meal - eat up" .)