A thin fog kept Land's End in the thick of things (6)
I believe the answer is:
amidst
'the thick of things' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'a thin fog kept land's end' is the wordplay.
'thin fog' becomes 'mist' (I've seen this before).
'kept' indicates putting letters inside.
'land's end' becomes 'd' (I can't explain this - if you can you should believe this answer much more).
'mist' placed around 'd' is 'midst'.
'a'+'midst'='AMIDST'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for amidst that I've seen before include "During; within" , "Admits (anag.)" , "Among" , "contained" , "Embraced by" .)