Shatter cold frame (5)
I believe the answer is:
crack
'shatter' is the definition.
(thesaurus)
'cold frame' is the wordplay.
'cold' becomes 'c' (eg on taps).
'frame' becomes 'rack' (rack is a kind of frame).
'c'+'rack'='CRACK'
(Other definitions for crack that I've seen before include "Brilliant" , "Take severe measures - . . . . . down on" , "Go for expert" , "Witticism" , "bang" .)