3a.Growing family of jazz fan, one aged about 100(9)
10a.Long to pull in flag-worker for drug production(10) think it ends in E
6d.Range cools down? I've hot cooking inside(7,5)??????T ?I??? fired?
Robert Browning wrote "Asolando" and also a prolog & an epilog to Asolando - I can only assume the quote is in the main poem - it's not in the prolog or epilog.
3a cactaceae is correct. Cactaceae means: constituting the order Opuntiales, which is a family of cactus plants.
Jazz fan is a cat. "One aged about 100" means insert C into cat to get cact----- I can't explain the rest of the word!
22a asolando is correct. The clue is not a quote from the poem. It is a play on the title. "Like nothing" = as o; "Set down nothing" = land [as aircraft] o.