Passage for those who are boring? (9)
I believe the answer is:
mineshaft
'passage for those who are boring?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'passage for those' is the wordplay.
'passage' becomes 'shaft' (shaft is a kind of passage).
'for' says to put letters next to each other (I've seen this in other clues).
'those' becomes 'mine' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'shaft' put after 'mine' is 'MINESHAFT'.
Can you help me to learn more?
(Other definitions for mineshaft that I've seen before include "Vertical hole" , "one's got bored" , "not a feature of 4, 21 [OPENCAST MINING]" .)