Clue: Agreed to smash one of the old gods that screw man (10)
Answer: ARCHIMEDES
Explanation: Definition: that screw man
definition is a reference to the Archimedes Screw 
CHIMED="Agreed" in ARES=god of war in Greek mythology="one of the old gods"
 
chimed='was in harmony [with]' e.g. 'their view chimed with ours'