Start to chase unruly male animal (5)
I believe the answer is:
camel
'animal' is the definition.
(I've seen this before)
'start to chase unruly male' is the wordplay.
'start to' says to take the initial letters.
'unruly' is an anagram indicator.
The first letter of 'chase' is 'c'.
'male' anagrammed gives 'amel'.
'c'+'amel'='CAMEL'
(Other definitions for camel that I've seen before include "Old WWI plane" , "Light yellowish-brown colour - ruminant" , "Humped creature" , "It is called the ship of the desert" , "African carrier" .)