Fighter who's creating a splash (7)
I believe the answer is:
spatter
'a splash' is the definition.
(synonyms)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for spatter that I've seen before include "Sprinkle" , "Cover with droplets" , "shower" , "Set part (anag.)" , "spray" .)