Amazing bats flew round (9)
I believe the answer is:
wonderful
'amazing' is the definition.
(thesaurus)
'bats flew round' is the wordplay.
'bats' is an anagram indicator (I've seen this in other clues).
'flew'+'round'='flewround'
'flewround' with letters rearranged gives 'WONDERFUL'.
(Other definitions for wonderful that I've seen before include "Excellent" , "Fantastic, terrific" , "Awe-inspiring" , "Extraordinary" , "Fab" .)