A depth measure including temperature is extraordinary (10)
I believe the answer is:
astounding
'extraordinary' is the definition.
(I've seen this before)
'a depth measure including temperature' is the wordplay.
'depth measure' becomes 'sounding' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'including' means one lot of letters goes inside another.
'temperature' becomes 't' (abbreviation).
'sounding' placed around 't' is 'stounding'.
'a'+'stounding'='ASTOUNDING'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for astounding that I've seen before include "Stunning" , "Amazing" , "Extraordinary" .)