Chucked out, head off down (7)
I believe the answer is:
ejected
'chucked out' is the definition.
('eject' can be a synonym of 'chuck out')
'head off down' is the wordplay.
'head off' means to remove the first letter.
'down' becomes 'dejected' (similar in meaning).
'dejected' with its initial letter removed is 'EJECTED'.
(Other definitions for ejected that I've seen before include "Evicted" , "Threw out" , "Disgorged" , "Expelled, booted out" , "Ousted" .)