Overly catty sign during party - I'm not staying! (6-2)
I believe the answer is:
toodle-oo
'i'm not staying' is the definition.
I can't judge whether this definition defines the answer.
'overly catty sign during party' is the wordplay.
'overly' becomes 'too' (to too great a degree).
'catty sign' becomes 'leo' (star sign. I am not sure about the 'catty' bit.).
'during' is an insertion indicator.
'party' becomes 'do' (do is a kind of party).
'leo' placed into 'do' is 'dleoo'.
'too'+'dleoo'='TOODLE-OO'
Can you help me to learn more?
(Other definitions for toodle-oo that I've seen before include "Bye-bye!" , "Bye!" , "Goodbye (dated)" , "Farewell (old inf.)" , "Ta-ta" .)