One article included in stuff, some of mine (7)
I believe the answer is:
pithead
This could be a double definition.
'one article included in stuff' is the first definition.
I can't judge whether this definition defines the answer.
'some of mine' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
Can you help me to learn more?
(Other definitions for pithead that I've seen before include "top of shaft" , "is partly mine" , "area of mine" , "where miners would.meet" , "something over working?" .)