Scout turning to girl as usual (9)
I believe the answer is:
customary
'as usual' is the definition.
(I've seen this before)
'scout turning to girl' is the wordplay.
'turning to' is an anagram indicator (the letters can turn into other words).
'girl' becomes 'mary' (girl's name).
'scout' anagrammed gives 'custo'.
'custo'+'mary'='CUSTOMARY'
(Other definitions for customary that I've seen before include "According to usual practice" , "Normal, usual" , "Courts may find this usual" , "In accordance with convention" , "Habitual, usual" .)