The most common and most likely answer to this crossword clue is the 10 letter word UNRIVALLED
U
N
R
I
V
A
L
L
E
D
Buddy explains!
The straight part
We know that "It’s without equal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it’s without equal = unrivalled.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 UNRIVALLED mean?
UNRIVALLED adjective- Having no rival; better than any possible competitor