Possible Clues:

• Sticky stuff from pine trees
• Ingredient in plastics
• It's a sticky matter if one is a second offender
• Risen (anag.)
• How the reins get twisted about the end of 23 across
• If you might be a second offender, that's a sticky matter
• To be a second offender is a sticky matter
• Substance from the sap of trees
• Sticky stuff oozing from trees
• Organic polymer