Possible Clues:

• Go for this at university
• See 2
• There's not much in the till for ET
• Not much less than 20 across
• Insignificant
• You need to go after this before you can go on to a degree (6)
• Started the fire and allow it to be hidden a bit
• After it's lighted let it not be like to first of 12 across
• Small in size, most of brood left inside
• That's not much to go for at university