The most common and most likely answer to this crossword clue is the 8 letter word TEENIEST
I've seen this crossword clue in The Daily Telegraph
T
E
E
N
I
E
S
T
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 TEENIEST mean?
TEENIEST adjective- Very small; tiny.