The most common and most likely answer to this crossword clue is the 3 plus 2 plus 3 letter word NOT AT ALL
I've seen this crossword clue in The Daily Telegraph
N
O
T
A
T
A
L
L
More clues leading to the result NOT AT ALL
- It’s a pleasure to see absence of rubbish at the shops —no hint of muck
- No farewell to learners — in no way!
- It’s my pleasure to write endlessly on everything
- Only items of quality, every one for my pleasure
- Presumably a short deprecatory remark
- A hundred up unlikely? Don’t mention it!
- You’re welcome? Never!
- No thanks required by count, last off, so don’t mention it
- It’s a pleasure no former volunteer exaggerated
- No thanks! Great! Don't mention it!
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.