Shortly, to Shakespeare (4)
I believe the answer is:
anon
'shortly to shakespeare' 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" , "Of unknown authorship" , "Soon or presently" , "At another time and with no identity, in short" , "Not identified by name" .)