The most common and most likely answer to this crossword clue is the 6 letter word SIRREE
I've seen this crossword clue in Independent
S
I
R
R
E
E
Buddy explains!
The straight part
We know that "emphatic way to address Trump?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case emphatic way to address trump? = sirree.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SIRREE mean?
SIRREE noun- (used as an intensifier, emphatically, after yes or no) Sir.