Yarra river ? 

You got it 😀

reverse array = Yarra

headless motorist = driver without the d = river

winning Courier jumped in refers to tennis player Jim Courier famously jumping in the river after his Australian Open win in 1992

over to you janeababe

OMG yaaaaaaaaayyyyyyyyyy 😊😊😊😊

the reverse array is what gave it away to me. I had no idea what the winning courier had to do with it tbh lol 😆 

ok.... soooo.... I’m not skilled yet to invent a clue, so I’m getting some help. I hope that’s allowed. 

clue:   A Dublin novel comes in that is impossible to grasp. 
( 1 word- 9 letters ) 

good luck folks 😊

LOL - I cheated.

Inaudible?

Yes She_ele

you got it. 

😊😊

Now you're  s'posed to show everyone how it works.

LOL - She - perhaps you would.

OK.  A Dublin novel = anagram of A Dublin = naudibl 

comes in = is inside 

that is = ie

gives you i+naudibl+e  = inaudible