Arrived and left an animal (5)
I believe the answer is:
camel
'an animal' is the definition.
(I've seen this before)
'arrived and left' is the wordplay.
'arrived' becomes 'came' (come can mean to appear or arrive).
'and' says to put letters next to each other.
'left' becomes 'l' (common abbreviation).
'came'+'l'='CAMEL'
(Other definitions for camel that I've seen before include "Saddle animal in desert regions" , "Old WWI plane" , "Humped ungulate" , "It is called the ship of the desert" , "Desert ruminant" .)