Before thou know'st (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
anon
'before thou know'st' 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 "In the near future" , "Mystery writer" , "Nameless - presently" , "Shortly; unknown" , "Without known author" .)