Cryptic crossword clue
Runs through a tunnel breaking out not yet discovered

The most common and most likely answer to this crossword clue is the 8 letter word UNLEARNT

I've seen this crossword clue in The Guardian
U
N
L
E
A
R
N
T

More clues leading to the result UNLEARNT

Buddy explains!

The straight part
We know that "not yet discovered" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not yet discovered = unlearnt.
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 UNLEARNT mean?

UNLEARNT verb
  1. To discard the knowledge of.
  2. To break a habit.
UNLEARNT adjective
  1. Innate, inherent or inborn.
  2. Not educated

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