The ushers have no aspiration to become operators (5)
I believe the answer is:
users
'operators' is the definition.
(I've seen this before)
'the ushers have no aspiration' is the wordplay.
'have no' indicates named letters should be taken away.
'aspiration' becomes 'h' (I've seen this in other clues).
'ushers' with 'h' removed is 'USERS'.
'to become' is the link.
(Other definitions for users that I've seen before include "Operators" , "People with a drug habit" , "People who take drugs" , "Drug takers" , "Drug addicts" .)