The most common and most likely answer to this crossword clue is the 12 letter word SHARPSHOOTER
I've seen this crossword clue in The Sunday Telegraph
S
H
A
R
P
S
H
O
O
T
E
R
More clues leading to the result SHARPSHOOTER
- First of smut at end of pointed nose one picks off easily?
- Marksman’s new photos held by sharer
- Skilled marksman notes owl
- Marksman notes facial feature
- Sniper, quiet operator, worried about silence
- Marksman’s mum raps criminal on the nose
- He’s likely to hit crooked dealer’s nose
- Marksman notes part of face
- Deadly gunman –- note small nose
- Instrument on board with siren? One’s bang on target
Buddy explains!

The straight part
We know that "Marksman" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case marksman = sharpshooter.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 SHARPSHOOTER mean?
SHARPSHOOTER noun- A person trained to shoot precisely with a rifle; a marksman.