The most common and most likely answer to this crossword clue is the 9 letter word TAILPIECE
T
A
I
L
P
I
E
C
E
Buddy explains!
The straight part
We know that "It is added at the end" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it is added at the end = tailpiece.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 TAILPIECE mean?
TAILPIECE noun- An appendage or appendix.
- An element, often triangular, to which the strings of a violin, guitar, etc. are attached at the lower end of an instrument.
- A short joist between a header and a wall.
- The part of a telescope containing the adjusting device for the eyepiece, etc.
- The part of a lock that transmits motion from the hub to the latch bolt.