Deep sort of truss developed in Lincoln (8)
I believe the answer is:
abstruse
'deep' is the definition.
(I know that deep can be written as abstruse)
'truss developed in lincoln' is the wordplay.
'developed' indicates an anagram.
'in' indicates putting letters inside.
'lincoln' becomes 'abe' (Abraham Lincoln).
'truss' is an anagram of 'strus'.
'strus' going within 'abe' is 'ABSTRUSE'.
'sort of' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for abstruse that I've seen before include "Difficult to penetrate or understand" , "Hard to understand, recondite" , "Incomprehensible to those with normal understanding" , "Esoteric" , "Obscure or recondite" .)