Indian jumbo perhaps a plane in haste diverted? (5,8)
I believe the answer is:
asian elephant
'indian jumbo perhaps' is the definition.
(Indian elephant is a type of Asian elephant)
'a plane in haste diverted?' is the wordplay.
'diverted?' is an anagram indicator (each letter get diverted elsewhere).
'plane'+'in'+'haste'='planeinhaste'
'planeinhaste' anagrammed gives 'sianelephant'.
'a'+'sianelephant'='ASIAN ELEPHANT'
(Other definitions for asian elephant that I've seen before include "Large herbivorous animal native to India, Nepal, Myanmar, Borneo and Sumatra" , "Jumbo from India" , "Smaller-eared jumbo" , "Very large mammal" .)