Impressive photograph online? (4)
I believe the answer is:
epic
'impressive' is the definition.
(epic can mean grand or impressive)
'photograph online?' is the wordplay.
I cannot quite see how this works, but
'photograph' could be 'pic' (short for picture) and 'pic' is found in the answer.
'online?' could be 'e' (abbreviation for electronic, e.g. in ecommerce) and 'e' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for epic that I've seen before include "On a grand scale, maybe a poem" , "Surpassing the ordinary" , "Long poem/story" , "great film" , "Long adventure story" .)