Order eggs flipped, showing affirmation (6)
I believe the answer is:
avowal
'affirmation' is the definition.
(synonyms)
'order eggs flipped' is the wordplay.
'order' becomes 'law'.
'eggs' becomes 'ova' (I've seen this before).
'flipped' is a reversal indicator.
'law'+'ova'='lawova'
'lawova' reversed gives 'AVOWAL'.
'showing' acts as a link.
(Other definitions for avowal that I've seen before include "clear pronouncement" , "Open assertation" , "Statement" , "Affirmation" , "Positive declaration" .)