Surface temperature on Mars, say (6)
I believe the answer is:
planet
'mars say' is the definition.
(Mars is an example)
'surface temperature' is the wordplay.
I cannot really 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 located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'on' is the link.
Can you help me to learn more?
(Other definitions for planet that I've seen before include "Celestial body that revolves around the sun" , "Mercury?" , "body in orbit" , "Neptune, for example" , "Large celestial body" .)