By sound of it, is aware of seedy club - sudden fall results? (4,4)
I believe the answer is:
nose dive
'by sound' is the definition.
'nose-dive' can be an answer for 'sound' (thesaurus). I'm unsure of the 'by' bit.
'it is aware of seedy club sudden fall results?' is the wordplay.
I cannot really see how this works, but
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is present in the answer.
'club' could be 'dive' (I've seen this in other clues) and 'dive' is present in the answer.
The remaining letters 'nos' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for nose dive that I've seen before include "Dramatic drop" , "Steep downward plunge by aircraft" , "Steep descent" , "Headlong descent" , "Steep vertical plunge" .)