Some flood is, as termed, washout (8)
I believe the answer is:
disaster
'washout' is the definition.
(thesaurus)
'some flood is as termed' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'DISASTER' can be found hidden inside 'flood is as termed'.
(Other definitions for disaster that I've seen before include "Catastrophe, tragedy" , "terrible trouble" , "Calamity, tragedy" , "complete failure" , "not a success!" .)