Part of play passed by Parliament (3)
I believe the answer is:
act
'part of play' is the definition.
(a play is made up of acts)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for act that I've seen before include "Major section of a play" , "Function" , "Subdivision of a play" , "Produce an effect" , "Feat" .)