Girl included in first college show (6)
I believe the answer is:
evince
'show' is the definition.
(I know that show can be written as evince)
'girl included in first college' is the wordplay.
'girl' becomes 'eve' ().
'included' means one lot of letters goes inside another.
'first' says to take the initial letters.
The first letter of 'college' is 'c'.
'in'+'c'='inc'
'eve' placed around 'inc' is 'EVINCE'.
(Other definitions for evince that I've seen before include "Show or display clearly" , "Show, disclose" , "Make evident" , "Indicate or display, say a feeling" , "Indicate, show clearly" .)