Quotation notation (4)
I believe the answer is:
anon
'quotation notation' 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 "Immediately" , "At another time and with no identity, in short" , "At another time, of old" , "Soon or presently" , "Nameless (abbr.); soon" .)