Revue segment (3)
(Other definitions for act that I've seen before include "Feat" , "Perform(ance)" , "Do something (on stage?)" , "Major section of a play" , "Pretend to be - deed" .)
'revue segment' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for skit that I've seen before include "Short play which makes fun of something" , "Funny scene" , "Satirical drama" , "Short humorous play" , "that may be produced by 19 [PARODIST]" .)