Cast worth shuffling (5)
I believe the answer is:
throw
'cast' is the definition.
(I know that cast can be written as throw)
'worth shuffling' is the wordplay.
'shuffling' indicates anagramming the letters.
'worth' anagrammed gives 'THROW'.
(Other definitions for throw that I've seen before include "lose on purpose" , "Fling; confound" , "Cast; give (party)" , "Dumbfound" , "pitch or > floor" .)