A light meal of nutmeg top in wine (5)
I believe the answer is:
snack
'a light meal' is the definition.
(I've seen this before)
'nutmeg top in wine' is the wordplay.
'top' indicates taking the first letters.
'in' indicates putting letters inside.
'wine' becomes 'sack' (sack is a kind of wine).
The first letter of 'nutmeg' is 'n'.
'n' inserted inside 'sack' is 'SNACK'.
'of' acts as a link.
(Other definitions for snack that I've seen before include "Elevenses?" , "Quick bite to eat" , "Small or huried meal" , "fast food" , "Light bite" .)