The most common and most likely answer to this crossword clue is the 15 letter word TINTINNABULATED
I've seen this crossword clue in The Guardian
T
I
N
T
I
N
N
A
B
U
L
A
T
E
D
Buddy explains!

The straight part
We know that "rang" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rang = tintinnabulated.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.
Crossword Answer definitions
TINTINNABULATED verb- To ring, tinkle, toll, or otherwise sound like bells.