The most common and most likely answer to this crossword clue is the 7 letter word DORMICE
I've seen this crossword clue in The Guardian
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More clues leading to the result DORMICE
- Rodents, evidence of very cold student accommodation?
- Room to rest together and chill — will they have nibbles?
- Rodents a horror in boarding school on winter nights?
- Little rodents in sleeping area freeze
- Rodents party, beginning to munch through cereal
- Rodents cooler in student accommodation?
- Do marines kill rodents?
- Boarding school bedroom is considered excellent to begin with for sleepy little creatures
- Party about to welcome master in charge of rodents
- Various mediocre, tailless rodents
Buddy explains!

The straight part
We know that "rodents" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rodents = dormice.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does DORMICE mean?
DORMICE noun- Any of several species of small, mostly European rodents of the family Gliridae; also called Myoxidae or Muscardinidae by some taxonomists.
- Glis glis, the edible dormouse
- Muscardinus avellanarius, the hazel dormouse.
- A person who sleeps a great deal, or who falls asleep readily (by analogy with the sound hibernation of the dormouse).