Puzzle solver's goal (8)
I believe the answer is:
solution
'puzzle solver's goal' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for solution that I've seen before include "The answer sought" , "Key" , "What you want here" , "A mixture of liquid substances is the answer" , "Liquid mixture of two or more substances" .)