Sound measures to take in obscure situations (3,7)
I believe the answer is:
'sound measures to take' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'obscure situations' is the wordplay.
'obscure' becomes 'fog' (synonyms).
'situations' becomes 'signals' (I can't justify this - if you can you should believe this answer much more).
'in' is the link.
Can you help me to learn more?