School housing head of Little John (5)
I believe the answer is:
elton
'john' is the definition.
(musician Elton John)
'school housing head of little' is the wordplay.
'school' becomes 'eton' (famous UK public school).
'housing' is an insertion indicator.
'head of' says to take the initial letters.
The first letter of 'little' is 'l'.
'eton' placed around 'l' is 'ELTON'.
(Other definitions for elton that I've seen before include "Sir - - John, singer songwriter" , "..... Jonn (musician)" , ". . . . . John (musician)" , "One John" , "- John, British singer" .)