Conventional scout bizarrely worshipped mother (9)
I believe the answer is:
customary
'conventional' is the definition.
(similar in meaning)
'scout bizarrely worshipped mother' is the wordplay.
'bizarrely' indicates anagramming the letters.
'worshipped mother' becomes 'mary' (Mary is an example. I am not sure about the 'worshipped' bit.).
'scout' anagrammed gives 'custo'.
'custo'+'mary'='CUSTOMARY'
Can you help me to learn more?
(Other definitions for customary that I've seen before include "Courts may find this usual" , "Conventional" , "precedent" , "In accordance with convention" , "Habitual, usual" .)