Fellow university student gets energy from this (4)
I believe the answer is:
fuel
'this' is the definition.
The definition suggests a singular noun which matches the answer.
'fellow university student gets energy' is the wordplay.
'fellow' becomes 'F' (abbreviation - of a society etc.).
'university' becomes 'u' (abbreviation for university).
'student' becomes 'l' (as in L-plates for learner drivers).
'gets' means one lot of letters goes inside another (gets can mean captures or absorbs).
'energy' becomes 'e' (physics symbol as in E=mc2).
'u'+'l'='ul'
'ul' placed around 'e' is 'uel'.
'f'+'uel'='FUEL'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for fuel that I've seen before include "Material for burning" , "Eg, coal or oil" , "Power source; inflame" , "Substance burned to source power" , "Coal or gas?" .)