Squat bed with end of cover tucked in (6)
I believe the answer is:
crouch
'squat' is the definition.
(to crouch is to squat down)
'bed with end of cover tucked in' is the wordplay.
'bed' becomes 'couch' (couch is a kind of bed).
'with end of cover' becomes 'r' (I am not sure about this - if you are sure you should believe this answer much more).
'tucked in' is an insertion indicator.
'couch' enclosing 'r' is 'CROUCH'.
(Other definitions for crouch that I've seen before include "Prepare to spring" , "Stoop with knees bent" , "Get down low" , "Bend low, preparing to spring" , "Hunker down" .)