"Out of the question!" (5)
(Other definitions for no can do that I've seen before include "That's not possible" , "That's out of the question!" , "Can't manage it, see doc anon" , "Unable to help" , "Bring-a-bottle party?" .)
'out of the question' is the definition.
(synonyms)
This is all the clue.
(Other definitions for impossible that I've seen before include "See 14 down" , "Hopeless" , "See 10" , "Not able to take place" , "Not able to exist" .)
'out of the question' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for never that I've seen before include "At no time whatever" , "when pigs fly" , "Not ever" , "Surely not" , "At no time in the past or future" .)