Gold car reversing round island I'm leaving... (2,6)
I believe the answer is:
au revoir
'i'm leaving' is the definition.
I can't judge whether this defines the answer.
'gold car reversing round island' is the wordplay.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'car' becomes 'rover' (former British car manufacturer).
'reversing' is a reversal indicator.
'round' is an insertion indicator.
'island' becomes 'i' (geographical abbreviation).
'rover' written backwards gives 'revor'.
'revor' going around 'i' is 'revoir'.
'au'+'revoir'='AU REVOIR'
Can you help me to learn more?
(Other definitions for au revoir that I've seen before include "cheers" , "Auf wiedersehen!" , "So long, 'bye for now - in France" , "'Goodbye to the French (2,6)'" , "'Bye for now, monseiur." .)