Short sausage getting so long in omelette (8)
I believe the answer is:
frittata
'omelette' is the definition.
(I have seen 'Italian omelette' mean 'frittata' so perhaps 'omelette' could also mean 'frittata')
'short sausage getting so long' is the wordplay.
'short sausage getting' becomes 'frit' (I can't explain this - if you can you should believe this answer much more).
'so long' becomes 'ta ta' (both are ways of saying goodbye).
'frit'+'tata'='FRITTATA'
'in' is the link.
Can you help me to learn more?
(Other definitions for frittata that I've seen before include "Italian dish" , "Italian omelette" .)