Refuse to dress with maturity (7)
I believe the answer is:
garbage
'refuse' is the definition.
('garbage' can be a synonym of 'refuse')
'dress with maturity' is the wordplay.
'dress' becomes 'garb' ('garb' can be a synonym of 'dress'**).
'with' is a charade indicator (letters next to each other).
'maturity' becomes 'age' (I've seen this before).
'garb'+'age'='GARBAGE'
'to' is the link.
(Other definitions for garbage that I've seen before include "Food waste or trash" , "Refuse - worthless talk" , "Waste, refuse" , "Pop group; rubbish" , "'Refuse, rubbish (7)'" .)