Nervous journalist disheartened guy (4)
I believe the answer is:
edgy
'nervous' is the definition.
('edgy' can be a synonym of 'nervous')
'journalist disheartened guy' is the wordplay.
'journalist' becomes 'ed' (short for editor).
'disheartened' says to hollow out the word (remove centre letters).
'guy' with its centre removed is 'gy'.
'ed'+'gy'='EDGY'
(Other definitions for edgy that I've seen before include "Overstrung" , "Uneasy" , "Visibly nervous" , "ready to flap?" , "Keyed up" .)