Order from Cheltenham's Head Girl (5)
I believe the answer is:
class
'order' is the definition.
(thesaurus)
'cheltenham's head girl' is the wordplay.
'head' suggests taking the first letters.
'girl' becomes 'lass' (lass is a kind of girl).
The initial letter of 'cheltenham' is 'c'.
'c'+'lass'='CLASS'
'from' acts as a link.
(Other definitions for class that I've seen before include "Category (of things)" , "Standing" , "Form; stylishness" , "sophistication" , "Teaching group" .)