Material on display requires renovation (6)
I believe the answer is:
repair
'renovation' is the definition.
(thesaurus)
'material on display' is the wordplay.
'material' becomes 'rep' (rep is a kind of material**).
'on' says to put letters next to each other.
'display' becomes 'air' (I've seen this before).
'rep'+'air'='REPAIR'
'requires' is the link.
(Other definitions for repair that I've seen before include "Fix, mend" , "Make one's way (to); fix" , "Restore, set right" , "resort" , "darn?" .)