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 definition defines the answer.
'new students chafe about on the contrary' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'students' becomes 'NUS' (National Union of Students).
'chafe about' becomes 'rub' (synonyms. I am not sure about the 'about' bit.).
'on' means one lot of letters go next to another.
'the contrary' is a reversal indicator.
'nus' after 'rub' is 'rubnus'.
'n'+'rubnus'='nrubnus'
'nrubnus' backwards 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" .)