Lying face upwards (6)
I believe the answer is:
supine
'lying face upwards' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for supine that I've seen before include "Lying face upwards, indolent" , "Prostrate" , "Lethargic" , "Use pin (anag.)" , "Inert; on one's back" .)