Work turned into alternative (6)
I believe the answer is:
option
'alternative' is the definition.
(I know that alternative can be written as option)
'work turned into' is the wordplay.
'work' becomes 'op' (short for opus).
'turned' is an anagram indicator.
'into' anagrammed gives 'tion'.
'op'+'tion'='OPTION'
(Other definitions for option that I've seen before include "Thing that may be chosen" , "The choice of taking or leaving" , "Something that may be chosen" , "Right to choose" , "possibility" .)