Possible Clues:

• Fellow working with a will
• One is appointed to carry out the terms of a will
• Will one's responsibility flower, given disruption of court?
• Not one that kills you but the one that sees to what you've left (8)
• One pursuing his duties with a will
• Man with willpower
• Overseer of a will
• One who has the will to deal with the remainder
• Will's been put in his charge
• Will need to have one for capital punishment, perhaps