Muse of history (4)
I believe the answer is:
clio
'muse of history' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for clio that I've seen before include "one historically inspiring" , "1 across's Muse - from Renault?" , "one of nine sisters" , "Muse of history (from Renault?)" , "inspiration for historians" .)