If foggy these could indicate stratus (5)
I believe the answer is:
sheet
'stratus' is the definition.
The definition and answer can be both natural objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'if foggy these could indicate' is the wordplay.
'these' can be anagrammed to 'SHEET'.
Though, I am not sure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for sheet that I've seen before include "Large piece of fabric" , "Single piece of paper" , "Page of postage stamps" , "Piece of paper or bedding" , "Piece of paper or bedlinen" .)