Yours truly at social event supplies food item (8)
I believe the answer is:
meatball
'food item' is the definition.
(meatball is a type of food item)
'yours truly at social event' is the wordplay.
'yours truly' becomes 'me' (the person that set this crossword).
'social event' becomes 'ball' (I've seen this in another clue).
'me'+'at'+'ball'='MEATBALL'
'supplies' acts as a link.
(Other definitions for meatball that I've seen before include "Food made from minced beef" , "faggot" , "Server might saucily supply this" , "Spherical mould of minced or chopped beef, pork or lamb" , "Something to savour" .)