Possible Clues:

• Add-on
• Supplementary part
• Usually not eligible for tenure, as a professor
• Supplement
• Father turns and 16 down what has been discarded, by the sound of it
• Rider's jacket and cape gathered separately by older relative
• Word or clause enlarging subject or predicate
• Supplementary feature of road junction
• Accessory
• In grammar, a word or clause enlarging the subject or predicate