Erelong (4)
I believe the answer is:
'erelong' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for anon that I've seen before include "Soon, in a little while" , "Nameless (abbr.); soon" , "Without known author" , "Not identified by name" , "Incognito (abbrev)" .)