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