Lazy drooping posture (6)
I believe the answer is:
slouch
'lazy drooping posture' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for slouch that I've seen before include "Sit with poor posture" , "Walk in an ungainly drooping manner" , "Droop" , "Slovenly gait or person (or hat)" , "Sit, stand or walk slovenly" .)