Recount catastrophic defeat (7)
I believe the answer is:
trounce
'defeat' is the definition.
(I know that trounce is a more specific form of defeat)
'recount catastrophic' is the wordplay.
'catastrophic' indicates anagramming the letters.
'recount' with letters rearranged gives 'TROUNCE'.
(Other definitions for trounce that I've seen before include "Aged skip" , "Defeat by large margin" , "Thrash" , "Thump" , "National flower of South Africa" .)