List of players joining United (4)
I believe the answer is:
menu
'list' is the definition.
(menu is a kind of list)
'players joining united' is the wordplay.
'players' becomes 'men' (eg men referring to the players in a football team).
'joining' says to put letters next to each other.
'united' becomes 'U' (abbreviation).
'men'+'u'='MENU'
'of' is the link.
(Other definitions for menu that I've seen before include "List of (computer or food) items" , "Bill of fare" , "Choice of dishes" , "restaurant guide" , "Card" .)