Hi ktbee - it's always nice to post the full clue, number of letters & any you've placed, so that people without the puzzle can more readily help you :-)
What a ridiculous answer if you haven't done the crossword, Hockney is just as idiosyncratic as Gauguin, Lowry, Picasso etc etc in fact any artist with a unique style but none of them are the same as each other, how can idiosyncratic be a style?
Rant over ;-)