The clue has one or two extra words or the wordplay has an extra letter.
10 Mascot, possibly, chasing darn flipping dog (6)
13. Rabbi spun and wove lined fabric (using rule for the first line) (7)
19. Catches Conservative peer in old Sierra (4)
22. Rabbie’s dish, twice shortened with lard, is lean (7)
In the silver cells, I have the same last two words. (6 each)
Only two poets come up who have used those words. But neither have used them in the last line.
Hankir, my last two words aren't those lengths - mine are 7 and 6. Your letters are correct for 6, 5 - it's not all a name. The poem isn't by a 'poet', as such.
Thanks ProfessorM and NAC.
Not any wiser.
I had Case for 15a.(Hidden with L extra for shell)
And do not have 20a.
What are the word lengths in silver cells. I presume it starts 3 and ends 7,6.