Possibly ate a meal (3)
I believe the answer is:
tea
'a meal' is the definition.
(tea is a type of meal)
'possibly ate' is the wordplay.
'possibly' indicates anagramming the letters.
'ate' with letters rearranged gives 'TEA'.
(Other definitions for tea that I've seen before include "Afternoon meal; drink" , "going to pot?" , "Food" , "and 18 Across: Utensils for afternoon meal" , "Strangely, ate this drink" .)