Alternative, choice (6)
I believe the answer is:
option
This clue is a double definition.
'alternative' is the first definition.
(I know that alternative can be written as option)
'choice' is the second definition.
(I know that choice can be written as option)
(Other definitions for option that I've seen before include "Freedom to choose" , "Choice of portion" , "An act of choosing" , "Alternative for choice" , "Something that may be chosen" .)