Possible Clues:

• Method of blending in fine, in mashed guacamole
• Disguise poor grade, below university standard — academic stream is superior
• Arrived to collect old university standard in disguise
• Arrived, carrying round university emblem, in disguise
• Hide male in a foul cage after beating
• Disguise chef finally having mixed guacamole outside
• One way to hide fluorine, in mashed guacamole
• 'Trick' used by the creatures found in rows 3, 5, 11 and 13
• Outfit you wouldn't want to be seen in
• Disguise with patchy colours? I don't see it myself!