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