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I need to solve this last clue - 19 across - study five hundred points. D?N.
Thank-you in advance for your help.

Den - a study.
D = 500 in Roman numerals
En = a point, it's a printing term, relating to a small space.

Malone - actually I think in this case, as the 'points' is plural, it's referring to points of the compass - E = East, N = North -
'en' and 'em' , the printer's blank pieces of type, are usually referred to as 'spaces', rather than points - 'point' in printing refers to the type height.

Quixote - I agree!