School accepting capital from Little John who sings (5)
I believe the answer is:
elton
'john who sings' is the definition.
'elton' can be an answer for 'john' (musician Elton John). I am not sure about the rest of the definition.
'school accepting capital from little' is the wordplay.
'school' becomes 'eton' (famous UK public school).
'accepting' indicates putting letters inside (inserted letters are accepted).
'capital from little' becomes 'l' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'eton' enclosing 'l' is 'ELTON'.
Can you help me to learn more?
(Other definitions for elton that I've seen before include "First name of singer/songwriter born Reginald Dwight in 1947" , "One John" , "Sir ___ John, singer-songwriter" , "Ben --; -- John" , "Let on he's John, the singer" .)