The most common and most likely answer to this crossword clue is the 8 letter word BACHELOR
I've seen this crossword clue in Independent
B
A
C
H
E
L
O
R
More clues leading to the result BACHELOR
- Unmarried man excited Chloe in pub
- Composer taking part after comeback — fellow yet to meet his match?
- Alec and Rob worried about Henry, fellow without a mate?
- Bishop has composed chorale for a single man
- Single chap, barman, withdrawn character
- Solo male part rejected by composer
- Scorer with elevated position, free man
- Composer’s part upset matchless fellow
- Composer has part played back for a single-minded man
- Composer rejected job – he has no ties
Buddy explains!

The straight part
We know that "Single chap" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case single chap = bachelor.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 BACHELOR mean?
BACHELOR noun- A person, especially a man, who is socially regarded as able to marry, but has not yet.
- The first or lowest academical degree conferred by universities and colleges; a bachelor's degree.
- Someone who has achieved a bachelor's degree.
- A bachelor apartment.
- An unmarried woman.
- A knight who had no standard of his own, but fought under the standard of another in the field.
- Among London tradesmen, a junior member not yet admitted to wear the livery.
- A kind of bass, an edible freshwater fish (Pomoxis annularis) of the southern United States.