Entering room in knickers, fashion victim? (4)
I believe the answer is:
mink
'fashion victim?' is the definition.
(animal killed for its fur)
'entering room in knickers' is the wordplay.
'entering' indicates a hidden word.
'MINK' is hidden within 'room in knickers'.
(Other definitions for mink that I've seen before include "Animal farmed for fur" , "Fur (garment)" , "A mammal; a fur coat" , "Animal with valued fur" , "Stoat-like carnivore" .)