Cryptic crossword clue
It required some hammering: panel fixed with n-ninety? 12, 2 words

The most common and most likely answer to this crossword clue is the 13 letter word TENPENNY NAIL

T
E
N
P
E
N
N
Y
Â
 
N
A
I
L

Buddy explains!

The straight part
We know that "It required some hammering" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it required some hammering = tenpenny nail.
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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