Paradoxical (6)
I believe the answer is:
ironic
'paradoxical' 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 "likely to provoke a wry smile" , "'Wry, incongruous (6)'" , "Wryly satirical" , "Sarcastically humorous" , "turning out unexpectedly" .)