Military servant, disheartened cricketer (6)
I believe the answer is:
batman
'military servant' is the definition.
(I've seen this before)
'disheartened cricketer' is the wordplay.
'disheartened' says to hollow out the word (remove centre letters).
'cricketer' becomes 'batsman' (I've seen this before).
'batsman' with its centre taken out is 'BATMAN'.
(Other definitions for batman that I've seen before include "who'd fight crime?" , "Masked crusader of cartoon and film" , "cartoon character" , "Caped crusader of Gotham City, cartoon or cinema" , "Officer's personal servant" .)