The most common and most likely answer to this crossword clue is the 7 letter word SINATRA
S
I
N
A
T
R
A
More clues leading to the result SINATRA
- Fresh in, a star singer
- Entertainer among travellers in a train
- Singer posed to accommodate popular artist
- Singer, needing no introduction, recalled material from the Highlands and Islands
- Fans in a train embracing singer
- Artisan turned performer
- In Wisconsin, a traditional singer
- Tsarina sacked entertainer
- Possibly train as a singer
- Performing great act of wickedness, one is expelled from halls
Buddy explains!

The straight part
We know that "singer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case singer = sinatra.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.