The most common and most likely answer to this crossword clue is the 5 letter word OLDEN
O
L
D
E
N
More clues leading to the result OLDEN
- Ancient line in poem forgotten, finally
- Former wife removed from bird sanctuary
- Long forgotten, maybe, or needing no introduction
- Past poetically revealed by wizened local, looking back
- Look up study of ancient history?
- Dead being interred, mostly smelly, rarely age
- Ancient line traced through ordinary study
- Relating to former times as happy without a bit of gloominess
- Ancient, somewhat wizened looking from the rear
- Good to leave happy – like times gone by
Buddy explains!

The straight part
We know that "rarely age" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rarely age = olden.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 OLDEN mean?
OLDEN adjective- From or relating to a previous era.
- Old; ancient.
- To grow old; age; assume an older appearance or character; become affected by age.