... author meets revised power play (3,9)
I believe the answer is:
the mousetrap
'play' is the definition.
(I've seen this before)
'author meets revised power' is the wordplay.
'revised' indicates anagramming the letters.
'power' becomes 'p'.
'author'+'meets'='authormeets'
'authormeets' with letters rearranged gives 'themousetra'.
'themousetra'+'p'='THE MOUSETRAP'
(Other definitions for the mousetrap that I've seen before include "Murder mystery" , "Long-running Agatha Christie play" , "Agatha Christie's West End long-runner" .)