Creature from public house in Namibia unruly (9)
I believe the answer is:
amphibian
'creature' is the definition.
(I know that amphibian is a type of ectotherm)
'public house in namibia unruly' is the wordplay.
'public house' becomes 'ph' (abbreviation).
'in' indicates putting letters inside.
'unruly' is an anagram indicator.
'namibia' with letters rearranged gives 'amibian'.
'ph' going into 'amibian' is 'AMPHIBIAN'.
'from' is the link.
(Other definitions for amphibian that I've seen before include "Frog, toad or newt" , "Animal that lives on land and in water" , "aircraft" , "Vehicle for use on land or water" , "versatile vehicle" .)