Sarcastic; wry (6)
I believe the answer is:
ironic
I believe this clue is a double definition.
'sarcastic' is the first definition.
(similar in meaning)
'wry' is the second definition.
(I know that wry can be written as ironic)
(Other definitions for ironic that I've seen before include "(Of a happening) having significance not perceived at the time" , "Humorously sarcastic or mocking" , "A form of sarcasm, may sound perverse" , "Cruelly humorous" , "Sarcastically humorous" .)