Absurd situation (9)
'absurd situation' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for joke that I've seen before include "Wisecrack" , "Gag" , "something in cracker" , "Humorous remark" , "Witticism, jest" .)
(Other definitions for pantomime that I've seen before include "Mime on tap in children's show" , "eg 'Mother Goose'" , "'Cinderella', for example" , "Traditional Christmas stage show with Dame" , "Seasonal theatre show" .)