Possible Clues:

• Figure almost dead? A long time left
• X, e.g.
• 1 or 2, say
• Variously L, M and N are initially used of number
• Perhaps 1 mule ran off
• Rebellious supermodel, a remunerative case for one?
• C or D, to old Romans
• Necessity in many passwords
• Figure or symbol like '1', for example
• Eg, seven