Hi, Casanova,
I didn’t like the clue at 7dn. You need to read it as fourth letter of “thirteen”, etc to get a four-letter plant that Chambers defines as a type of sum***.
In 22dn, Will’s suffusion is a definition of the first three letters of the answer, confirmed in Chambers. The word “not” needs to be treated to give an equivalent for the last four letters of the answer.
In 34ac, the definition is “several works”, of the type you might find on an industrial estate. The last three letters are deleted before entry. The wordplay leads to ACTOR (performer), contained in a 3-letter word that can mean “eccentric”, followed by the first letter of “stage”.