At heart (13)
'at heart' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
This is the entire clue.
Can you help me to learn more?
(Other definitions for central that I've seen before include "Focal" , "Most important, principal" , "Near the middle" , "Middle; crucial" , "Every answer here has one such letter" .)
'at heart' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for fundamentally that I've seen before include "In essence" , "At heart" , "At bottom" .)