Where plane could be no good in coastal fog (6)
I believe the answer is:
hangar
'where plane' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'no good in coastal fog' is the wordplay.
'no good' becomes 'ng' (abbreviation).
'in' is an insertion indicator.
'coastal fog' becomes 'haar' (I can't explain this - if you can you should believe this answer much more).
'ng' going into 'haar' is 'HANGAR'.
'could be' is the link.
Can you help me to learn more?
(Other definitions for hangar that I've seen before include "Aircraft shelter" , "Large building for housing aircraft" , "Airport shed" , "Structure where aircraft are maintained" , "Large shed for housing aircraft" .)