Fund lower after crash: great! (9)
I believe the answer is:
wonderful
'great' is the definition.
(both can mean amazing or grand)
'fund lower after crash' is the wordplay.
'after crash' is an anagram indicator (I've seen 'after crashing' mean this (the original order crashes or breaks)).
'fund'+'lower'='fundlower'
'fundlower' anagrammed gives 'WONDERFUL'.
(Other definitions for wonderful that I've seen before include "Fantastic, terrific" , "Great" , "Superb" , "Extraordinary" , "Remarkably good" .)