One sort of egg I consumed as pioneer (8)
I believe the answer is:
initiate
'pioneer' is the definition.
('initiate' can be a synonym of 'pioneer')
'one sort of egg i consumed' is the wordplay.
'one' becomes 'i' (Roman numeral).
'sort of egg' becomes 'nit'.
'consumed' becomes 'ate' (eating is a kind of consuming).
'i'+'nit'+'i'+'ate'='INITIATE'
'as' acts as a link.
(Other definitions for initiate that I've seen before include "starter" , "Cause to begin, launch" , "Make something begin" , "new member" , "found" .)