Ratify in advance President Trump's first meeting with a politician (8)

I believe the answer is:

prestamp

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'ratify' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'advance president trump's first meeting with a politician' is the wordplay.
'advance president' becomes 'pres' (I am not sure about this - if you are sure you should believe this answer much more).
'trump's first' becomes 't' (pst letter of 'trump').
'meeting with' means one lot of letters go next to another.
'politician' becomes 'MP' (Member of Parliament).
'pres'+'t'+'a'+'mp'='PRESTAMP'

'in' is the link.

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