Old man gets others round for a meal (6)
I believe the answer is:
repast
'for a meal' is the definition.
(repast can mean a meal)
'old man gets others' is the wordplay.
'old man' becomes 'pa' (both can mean someone's father).
'gets' indicates putting letters inside.
'others' becomes 'rest' (eg the rest of a group).
'pa' going within 'rest' is 'REPAST'.
'round' acts as a link.
(Other definitions for repast that I've seen before include "Banquet" , "lunch?" , "Something to eat" , "Prates about meal" , "Food - tapers (anag)" .)