Surface temperature on Mars, for example (6)
I believe the answer is:
planet
'mars for example' is the definition.
(Mars is an example)
'surface temperature' is the wordplay.
I cannot quite understand how this works, but
'surface' could be 'plane' (I've seen this before) and 'plane' is found within the answer.
'temperature' could be 't' (abbreviation) and 't' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'on' is the link.
Can you help me to learn more?
(Other definitions for planet that I've seen before include "Jupiter is one" , "Celestial body orbiting round a star" , "Heavenly (or earthly!) body" , "Orbiting heavenly body" , "Mercury?" .)