The most common and most likely answer to this crossword clue is the 6 letter word UNSUNG
I've seen this crossword clue in Financial Times
U
N
S
U
N
G
More clues leading to the result UNSUNG
- Antelope turns round, fencing in star
- Such heroes are not celebrated
- Remarked by no-one, wildebeest keels over under boiling sun
- Overlooked evening prayer without a choir?
- Overlooked a Parisian intimate being twisted inside
- A French star — good but not recognised
- Megastar Animals, doing comeback tour, like Spanish anthem
- Obscure star found in unknown new galaxy initially
- Irregularly judge cloistered nuns in order, not given due credit
Buddy explains!

The straight part
We know that "Remarked by no-one" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case remarked by no-one = unsung.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 UNSUNG mean?
UNSUNG adjective- Which has not been lauded or appreciated.
- Not sung.