6 clues have surplus letters in wordplay
further 6 clues are lacking letters
15d Evacuation caused by damaged smoke detector (9) i think the answer is NOSEBLEED...hoe does that parse please?
14a Tibetan ascetic's leader: "I'm all excited about international post" (5,4) SNAIL MAIL ?
I can see im all anagram in there but not the rest ?
8d Form group gets a new character on top (8) FEDERATE ??
26d Urchins burst into tears (4) ?U?S possibly anagram f burst with 1 extra letter ...but can't see it ...??
There's a similar deletion in the clue for 8d, the clue reads - ''Form group d[eta]ined... more than once'' (= 'fed' +'ate') around RE for the lesson [reversed].