Downhearted, having lost head and kicked out (7)
I believe the answer is:
ejected
'kicked out' is the definition.
('eject' can be a synonym of 'kick out')
'downhearted having lost head' is the wordplay.
'downhearted' becomes 'dejected' (similar in meaning).
'having lost head' means to remove the first letter.
'dejected' with its initial letter removed is 'EJECTED'.
'and' acts as a link.
(Other definitions for ejected that I've seen before include "Forced out" , "Thrust out" , "Ousted" , "Expelled, booted out" , "Threw out" .)