Cryptic crossword clue
Aircraft pioneer has not succeeded in brute to bring down 2,9

The most common and most likely answer to this crossword clue is the 2 plus 9 letter word DE HAVILLAND

D
E
H
A
V
I
L
L
A
N
D

Buddy explains!

The straight part
We know that "Aircraft pioneer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case aircraft pioneer = de havilland.
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.

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