Trump's party was open, amid near pandemonium (10)
I believe the answer is:
republican
'trump's party' is the definition.
'Republican' can be an answer for 'party' (Republican Party is an example). I'm not certain of the 'trump's' bit.
'open amid near pandemonium' is the wordplay.
I cannot quite see how this works, but
'open' could be 'public' (associated in meaning) and 'public' is located in the answer.
an anagram of 'near' is 'rean' which is located in the left over letters.
No letters remain.
This explanation may well be incorrect...
'was' acts as a link.
Can you help me to learn more?
(Other definitions for republican that I've seen before include "Eg Lincoln" , "in foreign party" , "American in party" , "American politician" , "Member of US political party" .)