Oasis fan arrived before the end of Wonderwall (5)
I believe the answer is:
camel
'oasis fan' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'arrived before the end of wonderwall' is the wordplay.
'arrived' becomes 'came' (coming is a kind of arriving).
'before' is a charade indicator (letters next to each other).
'the end of' suggests the final letters.
The final letter of 'wonderwall' is 'l'.
'came'+'l'='CAMEL'
Can you help me to learn more?
(Other definitions for camel that I've seen before include "African transport" , "Humped animal" , "Humped mammal" , "quadruped" , "Light yellowish-brown colour - ruminant" .)