Cast worth recasting (5)
I believe the answer is:
throw
'cast' is the definition.
(I know that cast can be written as throw)
'worth recasting' is the wordplay.
'recasting' indicates an anagram.
'worth' with letters rearranged gives 'THROW'.
(Other definitions for throw that I've seen before include "Cast, hurl" , "Try not to win" , "Cast, fling" , "Confuse - cast" , "Light cloth cover for furniture" .)