The most common and most likely answer to this crossword clue is the 5 letter word TRUCE
I've seen this crossword clue in Financial Times
T
R
U
C
E
More clues leading to the result TRUCE
- Loyal guards call initially for ceasefire
- Constant in genuine agreement to stop fighting
- On return, initially enjoyed short break from action
- Corps engaged in sincere termination of fighting
- The curtain rising over a lull in hostilities
- Conservative rightly accepts end to hostilities
- Note goes round old police: “Ceasefire!”
- Finally capitulate after rejecting short ceasefire
- Agreement to stop fighting about cute Romeo
- The Irish police previously replaced hard Peace Agreement
Buddy explains!

The straight part
We know that "Ceasefire" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ceasefire = truce.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 TRUCE mean?
TRUCE noun- A period of time in which no fighting takes place due to an agreement between the opposed parties
- An agreement between opposed parties in which they pledge to cease fighting for a limited time