Crossword Genius

Runs through a tunnel breaking out (not yet discovered) (8)

Ross

I believe the answer is:

unlearnt

'not yet discovered' is the definition.
(not learned yet)

'runs through a tunnel breaking out' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'through' is an insertion indicator (inserted letters go through the word).
'breaking out' indicates an anagram.
'a'+'tunnel'='atunnel'
'atunnel' with letters rearranged gives 'unleant'.
'r' inserted inside 'unleant' is 'UNLEARNT'.

(Another definition for unlearnt that I've seen is " Disregarded".)

I've seen this clue in The Guardian.
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