Girl in school lacking good name (7)
I believe the answer is:
colleen
'girl' is the definition.
(I know that colleen is a type of girl)
'school lacking good name' is the wordplay.
I cannot quite see how this works, but
'name' could be 'lee' and 'lee' is found within the answer.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for colleen that I've seen before include "Irish girl, English version" , "Find Irish girl in cell one" , "Gaelic girl with English spelling" , "Irish lass" , "Irish miss" .)