Phoenix's birthplace (5)
I believe the answer is:
ashes
'phoenix's birthplace' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ashes that I've seen before include "International competition" , "Remains of anything burnt" , "` `..... to ....., dust to dust' ' (prayer)" , "Remains from a cremation" , "Burnt residue" .)