Less than a foot to the right, on the map (3)
I believe the answer is:
toe
'map' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'less than a foot to the right on' is the wordplay.
'less than' becomes 'oe' (I can't explain this - if you can you should give a lot more credence to this answer).
'to the right' suggests the final letters (the letter on the right of the word).
'on' says to put letters next to each other.
The final letter of 'foot' is 't'.
'oe' after 't' is 'TOE'.
'the' acts as a link.
Can you help me to learn more?
(Other definitions for toe that I've seen before include "Conform-...the line" , "Extremity of the body" , "Lower tip of something" , "low digit" , "Drive obliquely" .)