I have the author and the quote.
Wordplays have one extra letter.
Not sure of:
21. Triads guarding stone base back training arrangements (9)
H is extra in word play.
22. Queen not party to meagre grant (4)
S is extra. ?ENK
I am not sure where the cryptic representation is but it could be in the bottom half where one entry has to be changed to make a word from the quote.
Thanks.
21 - Def is 'training arrangements' - Training for plants
22 - Def is mean - 7 letter word for meagre minus first letter and the usual abbreviation for our current queen.
Next to bottom row for the cryptic representation.