The most common and most likely answer to this crossword clue is the 4 plus 3 letter word BOER WAR
B
O
E
R
W
A
R
More clues leading to the result BOER WAR
- Crashing bore very sensitive about conflict
- Disheartened fighter rejected harsh conflict
- Conflict when Duke rejected redesigned wardrobe
- Wore bra uncomfortably in fight
- Rifle from the east protecting women during time of conflict
- Unruly row about last of ale in pub leading to historic set-to
- Old Etonian and Republican wife in bar fight
Buddy explains!
The straight part
We know that "historic set-to" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case historic set-to = boer war.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.