Mutual club? (5)
I believe the answer is:
joint
This might be a double definition.
'mutual' is the first definition.
(thesaurus)
'club?' is the second definition.
The definition and answer 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 joint that I've seen before include "Piece of meat - illegal smoke" , "Knee or elbow?" , "Structure by which bones are fitted together" , "cigarette with grass" , "Together - location" .)