Accommodation concealed by rising coastal fog (4)
I believe the answer is:
flat
'accommodation' is the definition.
(thesaurus)
'concealed by rising coastal fog' is the wordplay.
I cannot really see how this works, but
'by' could be 'at' and 'at' is found within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for flat that I've seen before include "Horizontal" , "one or more in uniform" , "not deep?" , "Level; pad" , "Boring - apartment" .)