Accustomed to be wearing scarlet around university (6)
I believe the answer is:
inured
'accustomed to' is the definition.
(I've seen this before)
'wearing scarlet around university' is the wordplay.
'wearing' becomes 'in' (wear in (and 'in' is fashionable)).
'scarlet' becomes 'red' ('red' can be a synonym of 'scarlet').
'around' is an insertion indicator.
'university' becomes 'u'.
'in'+'red'='inred'
'inred' enclosing 'u' is 'INURED'.
'be' is the link.
(Other definitions for inured that I've seen before include "used to it" , "Hardened, perhaps ruined" , "Accustomed to hardship" , "Toughened through exposure" , "Accustomed to something difficult" .)