This nail may be found in a boot (3)
I believe the answer is:
toe
This might be a double definition.
'this nail may be' is the first definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'a boot' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'found in' acts as a link.
Can you help me to learn more?
(Other definitions for toe that I've seen before include "One's nailed" , "'Little piggy'" , "Feature of footwear" , "Pedal extremity" , "Extremity of the body" .)