We are stuck on our last clue (again!) 30a: What glasses help myopics do is unbeatable (8) It contains L E E S ???? but we don't know the order, because the crossword is all about... ...
Parsing please: 10A (Tartare) Tame changed on single sailors with eastern sauce. I'm supposing the single sailors could be tar twice, with e for eastern. But tame changed...? 13A US conductors have... ...