Concerned with seeing dilapidated coal pit (7)
I believe the answer is:
optical
'concerned' is the definition.
Although both the answer and definition are adjectives, I don't see how they can define each other.
'seeing dilapidated coal pit' is the wordplay.
'seeing dilapidated' is an anagram indicator.
'coal'+'pit'='coalpit'
'coalpit' is an anagram of 'OPTICAL'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for optical that I've seen before include "Working with light" , "To do with sight, perhaps an illusion" , "Sort of illusion" , "Concerned with view" , "Concerning light" .)