Iron kind of cup (7)
I believe the answer is:
stirrup
This could be a double definition.
'iron kind' is the first definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'cup' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'of' is the link.
Can you help me to learn more?
(Other definitions for stirrup that I've seen before include "Bit of tack" , "supporter?" , "rider needs" , "Foot rest for a rider" , "Rider's footpiece" .)