I hope this is on the right track:  
>! Postal service standard [suffix abbreviations][1]   

Finish of bronze or finish of gold.  
>! Bronze is 3rd → RD (road) and gold is 1st → ST (street)  

Uncurse my bluff and the way will be told.  
>! bluff - fu → BLF (bluff) and WAY (way)   

In fiction and fact, at the edge of the grave.  
>!  In fi*ct*ion and fa*ct* → CT (court) and edge of grave → AVE (avenue)  

I'll fit in a tux if I see where you pave.   
>! OP addressed: if I see where you pave implies view → VW (view) fits nicely in tux (tuVWx)  
>!      
>! original try: a tux is a jacket with jct  fit inside giving JCT (junction) 

I'm a dragon's start — a circus split up.  
>! *dr*agon's start → DR (drive) and *cir*cus split → CIR (circle)

I'm a term's first part — to pass, sum it up!  
>! *ter*m's first part → TER (terrace) and PASS (pass) and, from OP, sum it → SMT (summit) 


Title: Confused… why?  
>! HWY (highway)  

  [1]: https://pe.usps.com/text/pub28/28apc_002.htm