Spectacular electronic illustration? (4)
I believe the answer is:
epic
'spectacular' is the definition.
(I've seen this in another clue)
'electronic illustration?' is the wordplay.
'electronic' becomes 'e' (as in e-mail or e-books).
'illustration?' becomes 'pic' (short for picture).
'e'+'pic'='EPIC'
(Other definitions for epic that I've seen before include "Long classic film" , "On a grand scale like long poem" , "Long poem telling of heroic events" , "Colossal" , "Vast in scale" .)