Given face down (5)
I believe the answer is:
prone
This clue is a double definition.
'given' is the first definition.
(I've seen this in another clue)
'face down' is the second definition.
(I've seen this before)
(Other definitions for prone that I've seen before include "Given" , "Showing a tendency" , "Lying flat" , "Lying face down - inclined" , "Placed face down" .)