Copies, briefly (5)
I believe the answer is:
dupes
'copies briefly' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dupes that I've seen before include "Hoodwinks" , "Fools, hoaxes" , "Gulls" , "Fools, deceives" , "People who have been fooled or swindled" .)