Related Clues:

• Sometimes successful, sometimes not
• Wayward boy captures vermin
• Sort of criteria I once dismissed as unpredictable
• Urge liar to reform - resistance would be unprincipled
• Rambling fellow's introduction in Anglo-Saxon
• Quick, careless
• Without pattern
• Random alternatives offered by Juke Box Jury panel?
• Dangerously rash
• One found in volcanic crater may be inconsistent
• Very unreliable chap who's a rodent catcher
• Such habits unsuitable for a professional soldier
• Inconsistent, dodgy criteria I'll have abandoned
• Wildly incautious
• One in a muddle, about 50, without sense of purpose