Mocking extract from memoir on icon (6)
I believe the answer is:
ironic
'mocking' is the definition.
(I've seen this before)
'extract from memoir on icon' is the wordplay.
'extract from' says the answer is hidden in the clue (some letters extracted from the clue).
'IRONIC' is hidden within 'memoir on icon'.
(Other definitions for ironic that I've seen before include "Humorous through perverse contrariness" , "Sneering" , "Meaning the contrary of what is expressed" , "turning out unexpectedly" , "Paradoxical, contradictory" .)