Rings student - hypocrisy goes round that removes heat (7)
I believe the answer is:
coolant
'removes heat' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'rings student hypocrisy goes round' is the wordplay.
'rings' becomes 'oo' (two O's - O resembles a ring).
'student' becomes 'l' (as in L-plates for learner drivers).
'hypocrisy' becomes 'cant' (I've seen this in other clues).
'goes round' means one lot of letters goes inside another.
'oo'+'l'='ool'
'ool' put into 'cant' is 'COOLANT'.
'that' is the link.
Can you help me to learn more?
(Other definitions for coolant that I've seen before include "Heat-removing fluid" , "This takes heat out of situation" , "Fluid that removes heat" , "Liquid or gas used to remove heat from something" , "used to prevent overheating" .)