Gratis, for nothing (4)
I believe the answer is:
free
I believe this clue is a double definition.
'gratis' is the first definition.
(I know that gratis can be written as free)
'for nothing' is the second definition.
(I've seen this in another clue)
(Other definitions for free that I've seen before include "Not fixed; not in use" , "Unrestrained" , "Without cost; liberate" , "Not employed" , "unoccupied)" .)