Possible Clues:

• Where there's a sign of a sting in the tail of it
• Eight sign of Zodiac, of arachnid family
• Venomous creature unnamed in sign?
• Stinger
• Many a November birth
• Sign positive, with 10 under 4/5 of 20
• Nearly twenty pence laid out on one old sign
• Zodiacal sign between Libra and Sagittarius
• Man is lacking in comparison - poor sign!
• Sign of the Zodiac