Cheap show by awful medium entertaining me, later us (4,6)

'cheap show' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'awful medium entertaining me later us' is the wordplay.
'awful' indicates anagramming the letters.
'entertaining' indicates putting letters inside.
'later' suggests the final letters (I've seen 'latest' mean this).
'us' becomes 'sum' (I am not sure about this - if you are sure you should believe this answer much more).
The last letter of 'me' is 'e'.
'e' inserted inside 'sum' is 'seum'.
'medium' is an anagram of 'dimemu'.
'dimemu'+'seum'='DIME MUSEUM'

'by' is the link.

Can you help me to learn more?