The most common and most likely answer to this crossword clue is the 5 letter word ADAGE
I've seen this crossword clue in The Times
A
D
A
G
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More clues leading to the result ADAGE
- “A day, long time” — proverb
- Current period a lengthy one for gnome
- Notice what women often don't give in saying
- 'Not the time before Christ' - well-known saying
- A daughter taking long time to see truism
- Saw part of broad agenda
- Saw how old Bill is?
- Saw commercial taking a long time
- Proverb used by head, a gentleman
- . Saw Gaudi occasionally over time
Buddy explains!

The straight part
We know that "gnome" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gnome = adage.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 ADAGE mean?
ADAGE noun- An old saying which has obtained credit by long use
- An old saying which has been overused or considered a cliché; a trite maxim