Even temperature on Earth? (6)
I believe the answer is:
planet
'earth?' is the definition.
(Earth is an example)
'even temperature' is the wordplay.
'even' becomes 'plane' ('plane' can be similar in meaning to 'even').
'temperature' becomes 't' (abbreviation).
'plane'+'t'='PLANET'
'on' is the link.
(Other definitions for planet that I've seen before include "Earth, for example" , "Eg, Mars, Venus" , "Satellite of a sun" , "Jupiter is one" , "Eg, Mars or Pluto" .)