Crossword Genius

Ex-president in awful rut with politician (5)

Ross

I believe the answer is:

trump

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

'ex-president' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'awful rut with politician' is the wordplay.
'awful' is an anagram indicator.
'with' is a charade indicator (letters next to each other).
'politician' becomes 'MP' (Member of Parliament).
'rut' anagrammed gives 'tru'.
'tru'+'mp'='TRUMP'

'in' is the link.

Can you help me to learn more?

(Other definitions for trump that I've seen before include "obstruction gone" , "reliable person" , "High-ranking card" , "Card of designated top suit" , "Ruff at cards" .)

I've seen this clue in The Daily Express.
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