Flashed to accursed crook (10)
I believe the answer is:
coruscated
'flashed' is the definition.
Although both the answer and definition are past participle verbs, I can't understand how one could define the other.
'to accursed crook' is the wordplay.
'crook' indicates anagramming the letters (a crooked or broken form of the letters).
'to'+'accursed'='toaccursed'
'toaccursed' anagrammed gives 'CORUSCATED'.
Can you help me to learn more?
(Another definition for coruscated that I've seen is " sparkled".)