Comic character flipping two eggs (6)
I believe the answer is:
tintin
'comic character' is the definition.
(I've seen this before)
'flipping two eggs' is the wordplay.
'two eggs' means two substitutions for 'egg'.
'flipping' is a reversal indicator.
'egg' becomes 'nit' (a nit is an insect egg).
'egg' becomes 'nit' (a nit is an insect egg).
'nit'+'nit'='nitnit'
'nitnit' reversed gives 'TINTIN'.
(Other definitions for tintin that I've seen before include "cartoon character" , "Herge's adventurer" , "Herge's adventurous young Belgian reporter" , "Herge's cartoon hero" , "Comic character" .)