Sarcastic (6)
'sarcastic' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for ironic that I've seen before include "Paradoxically amusing" , "Using the opposite of the truth for humorous effect" , "Dry (of wit)" , "Humorous through perverse contrariness" , "not as you'd expect" .)
(Other definitions for biting that I've seen before include "Mordant" , "(Of wit) harsh, cruel" , "Sarcastic; very cold" , "Acerbic" , "Painful or stinging" .)
'sarcastic' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for satirical that I've seen before include "of burlesque" , "Ridiculing" , "scornful" , "taunting?" , "Describing irreverent humour" .)