Inscrutable as a broken Greek god (7)
I believe the answer is:
deadpan
'inscrutable' is the definition.
Both the definition and answer are adjectives. Maybe you can see an association between them that I can't see?
'a broken greek god' is the wordplay.
'a broken' becomes 'dead' (dead can mean broken or damaged).
'greek god' becomes 'pan' (Pan is an example).
'dead'+'pan'='DEADPAN'
'as' is the link.
Can you help me to learn more?
(Other definitions for deadpan that I've seen before include "Keeping a straight face" , "Not giving anything away" , "Lifeless" , "Impassive" , "Betraying no emotion" .)