Crossword Genius

Largely dishonest idiot from USA entering further presidential address? (5,8)

Ross

I believe the answer is:

mount rushmore

I'm a little stuck... Click here to teach me more about this clue!

'further presidential address?' is the definition.
I know nothing about this answer so I can't judge whether this works.

'largely dishonest idiot from usa entering' is the wordplay.
I cannot quite understand how this works, but
'idiot' could be 'shmo' (I've seen this before) and 'shmo' is present in the answer.
'from' could be 'o' (I've seen this in other clues) and 'o' is found in the answer.
'entering' could be 're' (I've seen this in other clues) and 're' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for mount rushmore that I've seen before include "Where the leaders are stoned" , "national memorial" , "Where giant relief carvings of four US presidents are to be seen in South Dakota" .)

I've seen this clue in The Independent.
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