Become head girl at school? (3,2)
I believe the answer is:
get on
'become' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?
'head girl at school?' is the wordplay.
'head' says to take the initial letters.
'at' is a charade indicator (letters next to each other).
'school?' becomes 'eton' (famous UK public school).
The initial letter of 'girl' is 'g'.
'g'+'eton'='GET ON'
Can you help me to learn more?
(Other definitions for get on that I've seen before include "fare" , "Board (a bus)" , "Agree - embark - make progress" , "Board - prosper" , "Age; prosper" .)