List players supported by United (4)
I believe the answer is:
menu
'list' is the definition.
(list of dishes)
'players supported by united' is the wordplay.
'players' becomes 'men' (eg men referring to the players in a football team).
'supported by' is a charade indicator (letters next to each other) (in a down clue, some letters hold up others).
'united' becomes 'U' (abbreviation).
'men'+'u'='MENU'
(Other definitions for menu that I've seen before include "List of fare" , "Restaurant fare" , "List of (computer or food) items" , "List of items to choose from as in restaurant" , "List of dishes available in restaurant" .)