The most common and most likely answer to this crossword clue is the 10 letter word DETERMINER
D
E
T
E
R
M
I
N
E
R
More clues leading to the result DETERMINER
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 DETERMINER mean?
DETERMINER noun- (grammar) A member of a class of words functioning in a noun phrase to identify or distinguish a referent without describing or modifying it.
- (grammar) A dependent function in a noun phrase marking the NP as definite or indefinite. This function is usually filled by words in the determinative class but may be filled by other elements such as a genitive pronoun.
- Something that determines, or helps someone to determine, something else.