Made one act in two shakes (2,4)
I believe the answer is:
at once
'made one act in two shakes' is the definition.
I can't judge whether this definition defines the answer.
'made one act' is the wordplay.
'made' is an anagram indicator.
'one'+'act'='oneact'
'oneact' anagrammed gives 'AT ONCE'.
Can you help me to learn more?
(Other definitions for at once that I've seen before include "Right now, this instant" , "Instantly" , "'Without delay (2,4)'" , "Immediately, without delay" , "This instant - no delay (2,4)" .)