Possible Clues:

• Yes, sir, at the double!
• Yes, sir, at the double in such a woolly way
• Yes sir, at the double, before this
• Yes, sir, at the double; it's all clipped
• Amount available from black sheep?
• Yes Sir, at the double in such a woolly way
• Yes, 21 down, at the double with this
• The clipped answer is 'Yes, sir' at the double and then this
• Yes, Sir, at the double! They're so woolly
• Yes, sir - coming at the double with this