Wear the new conditions (7)
I believe the answer is:
weather
'conditions' is the definition.
(I've seen this before)
'wear the new' is the wordplay.
'new' indicates anagramming the letters.
'wear'+'the'='wearthe'
'wearthe' with letters rearranged gives 'WEATHER'.
(Other definitions for weather that I've seen before include "Local atmospheric conditions" , "Climatic conditions" , "State of the atmosphere" , "Meteorological state" , "Endure" .)