Crossword Genius

They're instrumental in president meeting aliens (8)

Ross

I believe the answer is:

trumpets

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'they're instrumental' is the definition.
The definition suggests an adverb but the answer is not.

'president meeting aliens' is the wordplay.
'president' becomes 'trump' (Donald Trump).
'meeting' is a charade indicator (letters next to each other).
'aliens' becomes 'ets' (ET is short for extraterrestrial).
'trump'+'ets'='TRUMPETS'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for trumpets that I've seen before include "Proclaims loudly like elephant sounds" , "Brass musical instruments" , "Brass wind instruments" .)

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