Having a twist (6)
I believe the answer is:
ironic
'having a twist' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ironic that I've seen before include "turning out unexpectedly" , "Double-edged" , "Cruelly funny" , "Strangely apt or inapt" , "Type of situation where one is mocked by fate" .)