Different menus are what's needed for computer access? (8)
I believe the answer is:
'what's needed for computer access?' is the definition.
(you use a username to log in)
'different menus are' is the wordplay.
'different' indicates anagramming the letters.
'menusare' anagrammed gives 'USERNAME'.
(Other definitions for username that I've seen before include "One's identifier on a computer" , "Login ID" , "Electronic identity" , "Person's computer ID" , "Something needed for logging in" .)