The most common and most likely answer to this crossword clue is the 7 letter word LASTING
I've seen this crossword clue in The Sunday Telegraph
L
A
S
T
I
N
G
More clues leading to the result LASTING
- Batting number eleven good, there for long while
- The French scam going on for ever?
- Surviving the French swindle
- Sat uncomfortably in heather, deep-rooted
- Left sat around at home, needing good following long-term
- Durable West Coast police operation?
- Evergreen heather covering area with banks of scarlet
- The French bass player is going on
- Enduring pain south of US city
- California city police operation, memorable
Buddy explains!

The straight part
We know that "memorable" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case memorable = lasting.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 LASTING mean?
LASTING verb- To perform, carry out.
- To endure, continue over time.
- To hold out, continue undefeated or entire.
- To shape with a last; to fasten or fit to a last; to place smoothly on a last.
- The action or state of persisting; the time during which something or someone persists.
- A durable woollen material formerly used for women's shoes.
- The act or process of shaping footwear on a last.
- Persisting for an extended period of time.
- Persisting forever.