Impassive god holding summit of Olympus (6)
I believe the answer is:
wooden
'impassive' is the definition.
(I've seen this in another clue)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for wooden that I've seen before include "Monotonous like timber" , "acting poorly?" , "clumsy" , "Lacking ease or grace, like a tree?" , "Unnatural (acting)" .)