Cast worth surprising (5)
I believe the answer is:
throw
'cast' is the definition.
(I know that cast can be written as throw)
'worth surprising' is the wordplay.
'surprising' is an anagram indicator.
'worth' is an anagram of 'THROW'.
(Other definitions for throw that I've seen before include "Deliberately lose" , "Try not to win" , "Hurl, fling" , "Make a pot" , "Toss" .)