Hot wash runs after cold programme (4,4)
I believe the answer is:
chat show
'programme' is the definition.
(I've seen this before)
'hot wash runs after cold' is the wordplay.
'runs' indicates anagramming the letters.
'after' means one lot of letters go next to another.
'cold' becomes 'C' (eg on taps).
'hot'+'wash'='hotwash'
'hotwash' anagrammed gives 'hatshow'.
'hatshow' put after 'c' is 'CHAT SHOW'.
(Other definitions for chat show that I've seen before include "TV entertainment programme" , "TV celeb programme" , "TV programme in which celebrities are interviewed informally" , "TV discussion programme" , "Late Late or Graham Norton's, say" .)