Lies in a forest stream (5)
I believe the answer is:
rests
'lies' is the definition.
('rest' can be a synonym of 'lie')
'in a forest stream' is the wordplay.
'in' indicates the answer is hidden within the clue.
'RESTS' is hidden within 'forest stream'.
(Other definitions for rests that I've seen before include "holidays" , "Pauses; relaxes" , "Takes one's ease" , "Takes a break" , "Relaxes, sleeps" .)