Writer Sontag (5)
I believe the answer is:
susan
'writer sontag' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for susan that I've seen before include "-- Howatch, novelist" , "- - Sarandon, film actress" , "sometimes lazy, passing round the condiments" , "Server at table's no lazy" , "Girl's name, meaning lily" .)