Pitch of the road (7)
'pitch' is the definition.
(I know that pitch can be written as tar)
'the road' is the wordplay.
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'road' becomes 'ar' (I can't justify this - if you can you should believe this answer much more).
't'+'ar'='TAR'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for tar that I've seen before include "Viscous liquid; sailor" , "Hearty" , "'Thick, dark, sticky liquid (3)'" , "Product of smoking cigarettes" , "Old salt, sailor" .)
This could be a double definition.
'pitch' is the first definition.
The definition and answer can be both substances as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'road' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'of the' is the link.
Can you help me to learn more?
(Other definitions for macadam that I've seen before include "Death in Venice author, Thomas ---" , "Road-surfacing material" , "Road surface made of broken stone and tar" , "Name associated with road surfaces" , "stones on the way" .)