Related Clues:

• The cultivation and care of arugula could be an intellectually demanding activity
• Brilliance — dash
• Great skill in performance
• Most of the heroic old city has a type of expertise
• Virtuosic old city set in Spanish coast
• Display of boldness
• Warrior almost takes old city with a display of great spirit
• Branch of aerospace engineering (it's not!)
• Scenic eco-trek (anag) — complex subject for boffins?
• Agricultural study of one of those in the cabbage family - in a funny way, it's not complicated
• A snag over admitting curtailment of party spirit
• Stereotypically arcane subject
• Brilliant and showy skill in performing
• Brain surgery?!
• Supporter about to enthuse briefly before United’s brilliant display