The usual pleasing puzzle from Quixote. Quite easy, I found, solving time, 14 mins. Would recommend these puzzles to beginners, clues self-contained with little cultural knowledge required (either classical or modern) to solve.
Notes on some clues below – happy to explain others, if asked.
* = anagram
ACROSS
1 MIS (CON DUC) T
9 DIOPTRE p (small page i.e. abbrevation for it) in (editor)*
19 ROUNDERS A pleasing, not too obvious, ‘hidden’
DOWN
5 CITRIC ACID Cryptic definition misleadingly presented to look like it might be an anagram. Good
11 NO (LI ME) TANG ERE
17 PERU SAL