Light-hearted student newspaper? (3)
I believe the answer is:
rag
'newspaper?' is the definition.
(informal term for a newspaper)
'light-hearted student' is the wordplay.
'light' becomes 'arc' (arc light is a kind of light).
'hearted' means to look at the middle letters.
'student' becomes 'ag' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The centre of 'arc' is 'r'.
'r'+'ag'='RAG'
Can you help me to learn more?
(Other definitions for rag that I've seen before include "students' excuse to misbehave?" , "Torn cloth or despised newspaper" , "Waste piece of cloth" , "Piece of cloth and student fun" , "Student carnival for charity" .)