You haven't given the clue! That's always a help, especially to those without a copy. I did the puzzle and there was Gamer, which came from letters hidden in the clue - I think that's probably it.
Hi davipde - yes, your 7a is incorrect. The definition for 7d is 'player' and the answer is, I believe, a modern term... given to those who enjoy playing on a computer or mobile device?
Hi Malone
I haven’t a clue re nicknames for the artists
I have ??x?n?m???? For 1a
I have various artists that fit the bill
But can’t seem to get the nicknames