sorry to disagree - there were several i didn't like here.
6a isn't pronounced as (4)
i don't like the definition or the last letter in 9a
11a "spiny" isn't needed - is it just there to make the clue easier?
i don't see how 19a works
"dated language in brief" is a bit extreme (or not extreme enough!) in 2d
"sign of disuse" is loose in 12d
in contrast to others, i didn't like 14d
18d why "fusty"?
21d what's "I appreciate" doing?
I did like 16a.