Some ermines (6)
I believe the answer is:
stoats
'some ermines' is the definition.
(I know this)
This is the entire clue.
(Other definitions for stoats that I've seen before include "Short-tailed weasels" , "Weasel-like mammals" , "European ermines" , "In winter, they're known as ermines" , "Their chestnut coats turn white in winter" .)