Order duck for special soldier (8)
I believe the answer is:
commando
'special soldier' is the definition.
'commando' can be an answer for 'soldier' (I've seen this before). I am unsure of the 'special' bit.
'order duck' is the wordplay.
'order' becomes 'command' (commanding is a kind of ordering).
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'command'+'o'='COMMANDO'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for commando that I've seen before include "specially-trained soldier" , "Royal Marine Corps soldier" , "Amphibious military unit" , "Soldier trained for raiding" , "Military raider" .)