Great electronic image? (4)
I believe the answer is:
epic
'great' is the definition.
'electronic image?' is the wordplay.
'electronic' becomes 'e' (as in e-mail or e-books).
'image?' becomes 'pic' (I've seen this in other clues).
'e'+'pic'='EPIC'
(Other definitions for epic that I've seen before include "Long poem telling of great events" , "Heroic; saga" , "Long, heroic story" , "Large in scale" , "On a grand scale, maybe a poem" .)