The most common and most likely answer to this crossword clue is the 5 plus 4 letter word NEVER MIND
I've seen this crossword clue in The Guardian
N
E
V
E
R
M
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D
More clues leading to the result NEVER MIND
- Flipping lair must contain rats? It doesn't matter
- Forget it? Number always on memory
- Don’t worry about the likes of rats, Ned
- Words of consolation always matter
- Men driven mad? Don’t become concerned
- Backing study covering rats maybe doesn’t matter
- Upset home’s full of pests? Don’t worry
- Don’t worry about men driven mad!
- Flipping lair contains rats and the like -- it doesn't matter
- Edward keeps some harmful creatures. Not to worry!
Buddy explains!
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.