Airline left India for Indonesian island (4)
I believe the answer is:
bali
'indonesian island' is the definition.
(island of Indonesia)
'airline left india' is the wordplay.
'airline' becomes 'BA' (British Airways).
'left' becomes 'l' (common abbreviation).
'india' becomes 'i' (phonetic alphabet: alpha, bravo, charlie etc.).
'ba'+'l'+'i'='BALI'
'for' acts as a link.
(Other definitions for bali that I've seen before include "Javanese island" , "Island in Indonesia" , "mountainous island" , "Middle East country" , "Indonesian island, east of Java" .)