The most common and most likely answer to this crossword clue is the 5 plus 6 letter word FIRST ELEVEN
I've seen this crossword clue in The Daily Telegraph
F
I
R
S
T
E
L
E
V
E
N
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.