Very still warm weather? It’s not a clear outcome (4,4)
I believe the answer is:
dead heat
'clear outcome' is the definition.
The answer and definition can be both states of affairs as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'very still warm weather? it's not a' is the wordplay.
I cannot really understand how this works, but
'very' could be 'dead' (dead can mean very or absolutely, eg 'dead wrong') and 'dead' is found in the answer.
'warm' could be 'heat' and 'heat' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for dead heat that I've seen before include "sporting tie" , "Racing tie" , "Race result in which two competitors finish exactly even" , "'An exact tie in a race (4,4)'" , "no decisive result" .)