Facetious "Who, me?” (3)
I believe the answer is:
moi
'facetious who me?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for moi that I've seen before include "Daniel arap . . ., Kenyan president for 24 years" , "Just me, monsieur" , "affected me" , "You surely don't mean me?" , "egoist" .)