Old show using a "them and us" trope reinvented (3,9)
I believe the answer is:
the mousetrap
'old show' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'a them and us trope reinvented' is the wordplay.
'and' is a charade indicator (letters next to each other).
'reinvented' indicates an anagram.
'a'+'them'+'us'+'trope'='athemustrope'
'athemustrope' anagrammed gives 'THE MOUSETRAP'.
'using' acts as a link.
Can you help me to learn more?
(Other definitions for the mousetrap that I've seen before include "Murder mystery" , "Agatha Christie's West End long-runner" , "Long-running Agatha Christie play" .)