List from Gentlemen Ushers (4)
I believe the answer is:
menu
'list' is the definition.
(menu is a kind of list)
'from gentlemen ushers' is the wordplay.
'from' indicates the answer is hidden within the clue.
'MENU' can be found hidden inside 'gentlemen ushers'.
(Other definitions for menu that I've seen before include "list of available courses" , "Range of dishes available" , "restaurant guide" , "Cafe's list" , "that can appear on computer screen" .)