On a grand scale (4)
I believe the answer is:
epic
'on a grand scale' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for epic that I've seen before include "Long literary work about great events" , "On a grand scale like long poem" , "Heroic narrative verse" , "eg Beowulf" , "long poem telling of heroic deeds" .)