Crossword Genius

President Donald's tense over son visiting this country (4)

Ross

I believe the answer is:

tusk

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'president donald's tense over son visiting this country' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'tense over son visiting this country' is the wordplay.
'tense' becomes 't' (abbreviation used in many dictionaries).
'over' says to put letters next to each other.
'son' becomes 's'.
'visiting' means one lot of letters goes inside another.
'this country' becomes 'uk' (from the perspective of a British newspaper).
's' put within 'uk' is 'usk'.
't'+'usk'='TUSK'

Can you help me to learn more?

(Other definitions for tusk that I've seen before include "'Long pointed tooth, of an elephant say (4)'" , "Ivory-coloured dentine" , "Long protruding tooth" , "Walrus horn" , "Elongated tooth" .)

I've seen this clue in The Telegraph.
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