Turning puce, I freeze over (3,2)
I believe the answer is:
ice up
'freeze over' is the definition.
(I've seen this before)
'turning puce i' is the wordplay.
'turning' is an anagram indicator.
'puce'+'i'='pucei'
'pucei' anagrammed gives 'ICE UP'.
(Other definitions for ice up that I've seen before include "get coat" , "Completely freeze" , "become frozen" .)