More dejected (6)
I believe the answer is:
sadder
'more dejected' is the definition.
('sad' is associated in meaning with 'dejected')
This is the entire clue.
(Other definitions for sadder that I've seen before include "Unhappier" , "Gloomier" , "More unhappy (but hopefully 1 down)" , "more blue" , "extra-blue?" .)