Yes, Elderly, K is perfectly correct - naturally! - with 'leaderette'. It's an anagram (ie rubbished) of 'delete' plus 'trea' which is the first half of 'treatise'. A leaderette is a short newspaper article.
I suddenly thought: "I can't remember 'lapwing' as an answer." In fact, 8 down is LAUWINE. Endlessly praise is LAU(d) without the 'd'...victory is WIN...and European is E. Put these in the order suggested in the clue for LAUWINE which is an avalanche...ie a landslide.
I hope your husband hasn't inked in his answers!