Cryptic crossword No 3,408

901 - Mull Up! - also available at https://ibendr.github.io/xwd/bendr/index.html along with over 500 more

Surprisingly smooth, given several not too familiar terms and bits of history. Clever left field definitions greatly added to the enjoyment. Faves include 17a,27a,28a, 2d,7d,16d,20d