Mud bricks are good enough in Lincoln? (5)

I believe the answer is:
adobe
'mud bricks' is the definition.
The answer and definition can be both substances as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'good enough in lincoln?' is the wordplay.
'good enough' becomes 'do' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'lincoln?' becomes 'abe' (Abraham Lincoln).
'do' placed into 'abe' is 'ADOBE'.
'are' is the link.
Can you help me to learn more?
(Other definitions for adobe that I've seen before include "Sun-dried brick clay" , "Mexican mud and straw brick, and the hut made of it" , "Clay used for sun-dried bricks" , "Building material of clay and straw dried in the sun" , "Clay for mud bricks" .)
