Very good again. I can see where the confusion re 4d comes from, fortunately I had 1a first. 20a was my favourite. Enjoyed the rhyming pair; and there’s almost a second pair if you say one of them in a certain way ;-)
2d - Answer is "rubber cushion" (a rather odd but accurate description) and is also a homophone/"outspoken" of "bore" as in 'to weary or annoy with tediousness'.
I had 1a as FOI, so no problem with 4d.
Odd anagram indicator in 14d. I can't see the parsing for 20a. Favourite was 7d.
The definition for 1d is, of course, wrong!