Cryptic crossword clue
Middle of the piece of timber’s reportedly unbroken 7,8

The most common and most likely answer to this crossword clue is the 8 plus 8 letter word PLANCK’S CONSTANT

I've seen this crossword clue in The Guardian
P
L
A
N
C
K
â
€
™
S
C
O
N
S
T
A
N
T

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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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