The most common and most likely answer to this crossword clue is the 5 letter word ADITS
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More clues leading to the result ADITS
Buddy explains!
The straight part
We know that "passages for access" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case passages for access = adits.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 ADITS mean?
ADITS noun- A horizontal or nearly horizontal passage from the surface into a mine, as contrasted with a shaft or vertical entry passage. An adit may be used for ventilation, haulage, drainage, or other purposes.