Broken pane with closet reflecting different colours (10)
I believe the answer is:
opalescent
'reflecting different colours' is the definition.
(opalescent means shining with multiple colours)
'broken pane with closet' is the wordplay.
'broken' indicates an anagram.
'with' means one lot of letters go next to another.
'pane' after 'closet' is 'closetpane'.
'closetpane' with letters rearranged gives 'OPALESCENT'.
(Other definitions for opalescent that I've seen before include "shimmering" , "Sparkling" , "Shot" .)