Worth recasting cast? (5)
I believe the answer is:
throw
'cast?' is the definition.
(synonyms)
'worth recasting' is the wordplay.
'recasting' indicates anagramming the letters.
'worth' anagrammed gives 'THROW'.
(Other definitions for throw that I've seen before include "Cast, lob" , "Light cloth cover for furniture" , "Deliberately lose" , "Form (pot) on a wheel" , "Confuse - cast" .)