Possible Clues:

• Mark goes without most of vacation? It's academic
• Subject of poem by 1 across
• Erudite sort
• No, a lot, by the sound of it, if one is one
• Pupil going off in car - hols!
• Gentleman's partner
• Type of energy securing high award? It's academic
• Second car outside house left for learner
• Student of the sun's written about carbon and hydrogen
• Student type of panel supplying energy welcomes central heating