Overheating complaint returning new students chafe about - on the contrary! (7)
I believe the answer is:
sunburn
'overheating complaint returning' is the definition.
I can't judge whether this defines the answer.
'new students chafe about on the contrary' is the wordplay.
'new' becomes 'n' (abbreviation as in New Testament NT).
'students' becomes 'NUS' (National Union of Students).
'chafe about' becomes 'rub' (synonyms. I am not sure about the 'about' bit.).
'on' says to put letters next to each other.
'the contrary' says the letters should be written in reverse.
'nus' after 'rub' is 'rubnus'.
'n'+'rubnus'='nrubnus'
'nrubnus' back-to-front is 'SUNBURN'.
Can you help me to learn more?
(Other definitions for sunburn that I've seen before include "Tan (or unsuccessful attempt at it)" , "Redness caused by exposure to the source of heat" , "Redness of the skin caused by solar rays" , "Painful browning of the skin" , "Effect of too much UV" .)