The most common and most likely answer to this crossword clue is the 6 letter word EXPIRY
E
X
P
I
R
Y
Buddy explains!
The straight part
We know that "ending?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ending? = expiry.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 EXPIRY mean?
EXPIRY noun- A date by which an object either should not be used or loses its value, depending upon the item.
- End; termination; expiration.
- Death.