Show there's a false claim about us (7)
I believe the answer is:
musical
'show' is the definition.
(I know that show can be written as musical)
'a false claim about us' is the wordplay.
'a false' indicates an anagram.
'about' indicates putting letters inside.
'claim' anagrammed gives 'mical'.
'mical' going around 'us' is 'MUSICAL'.
'there's' is the link.
(Other definitions for musical that I've seen before include "Melodic" , "Cats perhaps" , "Tuneful; stage work" , "Rent for one" , "Melodious" .)