Possible Clues:

• Field half a team in Spain
• As a rule it's grand, in actual fact
• Kingdom has king, extraordinary male
• Field of study in which student is surrounded by a lot of paper
• Real grand, as a rule
• Half of Spanish football team leaving the field
• Field of interest that's authentic to millions
• Area of interest/activity
• If one is 3 down, this is what one has - a thousand that's genuine
• The grand kingdom, actually