They show you very easily that it's six thirty (5,4)
I believe the answer is:
hands down
'easily that it's six thirty' is the definition.
'hands down' can be an answer for 'easily' (I've seen this before). I am unsure of the rest of the definition.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for hands down that I've seen before include "with ease" , "extremely easily" , "without difficulty" , "Common teaching command" , "Leaves - effortlessly" .)