The most common and most likely answer to this crossword clue is the 6 plus 5 letter word MIDDLE NAMES
I've seen this crossword clue in The Times
M
I
D
D
L
E
N
A
M
E
S
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.