The most common and most likely answer to this crossword clue is the 6 letter word NIECES
I've seen this crossword clue in Financial Times
N
I
E
C
E
S
More clues leading to the result NIECES
- . Pleasant son welcomes English relatives
- English seen in Riviera city society with family
- Relatives requiring new compositions without piano
- A German upset these French relations
- Relations with pleasant son involving sweetheart
- Relations terribly insecure, having abandoned biblical city
- Relations creating awful scene around one
- Second time scene is shot, for those who are relatively junior
- Relatives play out Scene I
- Scene I shot with relatives
Buddy explains!

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 NIECES mean?
NIECES noun- A daughter of one’s sibling, brother-in-law, or sister-in-law; either the daughter of one's brother ("fraternal niece"), or of one's sister ("sororal niece").