Things appropriate to youth at the outset (8)
I believe the answer is:
property
'things' is the definition.
(things owned by somebody)
'appropriate to youth at the outset' is the wordplay.
'appropriate' becomes 'proper' (associated in meaning).
'at the outset' says to take the initial letters.
The first letters of 'to youth' is 'ty'.
'proper'+'ty'='PROPERTY'
(Other definitions for property that I've seen before include "(A) characteristic; land, stocks etc." , "Attribute; chattel" , "Real estate" , "Owned item(s)" , "Premises" .)