Surface temperature on Mars, perhaps (6)
I believe the answer is:
planet
'mars perhaps' is the definition.
(Mars is an example)
'surface temperature' is the wordplay.
I cannot really see 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' acts as a link.
Can you help me to learn more?
(Other definitions for planet that I've seen before include "one of seven in suite" , "Earth perhaps" , "Neptune, for example" , "Mercury?" , "Eg, a ruby" .)