Possible Clues:

• Fizzy drink measure
• Metric capacity
• Measure for petrol
• It's a measure of the capacity covered up by Botticelli treatment
• Reading unit
• Over a pint needed to get engineer tiddly
• Volume from Marvell I treasure
• Amount of liquid in pail I trebled
• Illuminated note in volume
• In full, it represents a measure of liquid