Single cryptic clue
President's family happiest underground [8]
better cryptic clue for this after help in comments below
President's family is fictional creature [8]
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President's family happiest underground [8]
better cryptic clue for this after help in comments below
President's family is fictional creature [8]
I think the answer is
Explanation
"President's family" could be interpreted as Trump kin.
Trumpkin is a dwarf from the Chronicles of Narnia series and dwarfs are generally skilled in mining (underground). This may be where we say they are happiest (think of Snow White and the Seven Dwarfs and how happy they were to work in the mine).
Alternatively, Trumpkin the character is one of the "Old Narnian" underground and membership of this underground movement allows him "to escape harassment from the Telmarine usurpers of Narnia" suggesting that it is where he would be the happiest