The most common and most likely answer to this crossword clue is the 9 letter word ERSTWHILE
E
R
S
T
W
H
I
L
E
More clues leading to the result ERSTWHILE
- Former Welsh rite given a new twist
- Former wife in St. Helier, somehow
- … we slither nervously past
- Old version of Welsh rite
- Former Welsh rite translated
- Former monarch steps across Welsh borders
- Former wife involved in dancing this reel
- Dancing reels with ex
- One-time hits were played around back of hall
- Where it’s foolish to describe 50 as old
Buddy explains!

The straight part
We know that "Old" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old = erstwhile.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 ERSTWHILE mean?
ERSTWHILE adjective- Former, previous.
- Respected, honourable.
- Formerly; in the past.