Brag about former president meeting alien (7)
I believe the answer is:
trumpet
'brag about' is the definition.
(thesaurus)
'former president meeting alien' is the wordplay.
'former president' becomes 'trump' (Donald Trump. I am not sure about the 'former' bit.).
'meeting' is a charade indicator (letters next to each other).
'alien' becomes 'et' (extra terrestrial).
'trump'+'et'='TRUMPET'
Can you help me to learn more?
(Other definitions for trumpet that I've seen before include "Head" , "Proclaim loudly" , "beastly noise" , "What elephants do" , "Metal wind instrument" .)