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Assuming these are correct, can anyone help with the parsing ....?

12a. Charm of national completing the course at St Andrews? (6) - MASCOT (Charm)

I thought 'National' might be SCOT, but then that leaves MA for St Andrews so perhaps not.

1a. Rich old entrepreneurs all on vacation somewhere in Greece (6) - ?H?D?S - RHODES would fit the def. but I can't parse any of it.

http://www.crosswordsolver.org/forum/465955/times-25969?thread-page=

12a MA - Master of Arts, a course, and a SCOT might play the course at St Andrews.
1a RHODES first and last letters of the first 3 words of the clue. (All words on vacation (emptying) of their contents.