Playgoer regularly lost attendant (4)
I believe the answer is:
page
'attendant' is the definition.
(I know that page is a type of attendant)
'playgoer regularly lost' is the wordplay.
'regularly lost' means one should take alternating letters (letters removed at regular intervals).
The alternate letters of 'playgoer' are 'PAGE'.
(Other definitions for page that I've seen before include "Call out the name of" , "Young attendant for part of a book" , "servant-boy" , "Attendant - this is on one!" , "Kind of leaf, or boy in old court" .)