Nothing follows order for special serviceman (8)
I believe the answer is:
commando
'special serviceman' is the definition.
'commando' can be an answer for 'serviceman' (commando is a kind of serviceman). I am not certain of the 'special' bit.
'nothing follows order' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'follows' is a charade indicator (letters next to each other).
'order' becomes 'command' (commanding is a kind of ordering).
'o' after 'command' is 'COMMANDO'.
'for' is the link.
Can you help me to learn more?
(Other definitions for commando that I've seen before include "Army unit" , "Military raider" , "Shock troop unit" , "Soldier trained to carry out dangerous raids" , "Military unit specially trained for raids and assaults" .)