A bit casual in style, for Milan (8)
I believe the answer is:
informal
'a bit casual in' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
'style for milan' is the wordplay.
'style' indicates an anagram (style can mean to shape or design).
'for'+'milan'='formilan'
'formilan' is an anagram of 'INFORMAL'.
Can you help me to learn more?
(Other definitions for informal that I've seen before include "Casual and unceremonious" , "Casual, free and easy" , "Cosy -- loose" , "Casual or unofficial" , "If normal, be casual and without ceremony" .)