Sagged (6)
'sagged' is the definition.
('droop' can be a synonym of 'sag')
This is the entire clue.
(Other definitions for drooped that I've seen before include "Flagged" , "Sagged, wilted" .)
(Other definitions for wilted that I've seen before include "Lost strength and became limp" , "Drooped, became limp" , "Drooped as from heat" , "suffered in the heat" , "Of flowers, lost freshness and drooped" .)