Option (6)
'option' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for choice that I've seen before include "Act of selection" , "Preference" , "Variety" , "Act or power of selecting" , "Highly-rated" .)
'option' is the definition.
(I have seen 'An option' mean 'refusal' so perhaps 'option' could also mean 'refusal')
This is all the clue.
(Other definitions for refusal that I've seen before include "Rebuff" , "Act of declining to take or accept something" , "Stop by fence" , "Seal fur (anag.)" , "Declining of an offer" .)
'option' is the definition.
(call option is a kind of option)
This is the entire clue.
(Other definitions for call that I've seen before include "Shout; ring" , "Hail; visit" , "Name; visit" , "Assign a name to" , "That is enough" .)