Possible Clues:

• One boarding streetcar is head of university's Italian course
• It. dessert, literally pick me up
• Part of 13 to shove one into ill-fitting suit
• I squeeze into new suit for dessert
• Rich dessert, it is a rum (anag.)
• Dessert made with sponge cake
• Literally, 'pick me up'
• Trattoria dessert
• Italian dessert of cake, coffee and chocolate
• Literally, it's Italian for "pick-me-up"