Hello, Elle!
You have fallen into the setters trap at 15a!
A very hot thing could be a "singer", something that "singes" could leave a "burn".
I thought it was a fine clue!
12a, Think of the game of darts.
Forty could well be "double top", the flight assists the dart to fly.
18a, is "Quadragesima"
A "quad" can be a motor bike, frenzy, a "rage", "it" is "sa", "I'm" is in clue.
22a, Helps is "backs", "to" in clue, track is "ry", abbreviation for railway.
"Backstory". New word to me, and I have not investigated it.
5d, "a cappella" is unaccompanied.
The female is "Ella", but the first part is ringing the faintest of bells but not jumping out at me, so sorry!
Oh, you have seen the singe bit!
Well done!