Related Clues:

• Cylindrical military hat with peak and plume? Really has, ok
• A knock-out, but be quiet as it was on the head
• At last a knockout goes on ahead of the military
• Be quiet with a knockout on ahead of the military
• Be quiet. It's a knockout, so go on ahead
• Used to go on ahead of the army
• Military topper
• Hussar's topper
• Has manoeuvred an end to the contest: cap that!
• It's old hat to the army
• Headgear has to be removed before kick-off
• Headgear for fighter? Oh be quiet, it's a knockout
• Visored military cap
• Hackled headwear
• One covering for military head has shattering defeat