The most common and most likely answer to this crossword clue is the 7 letter word NAGGING
I've seen this crossword clue in The Daily Telegraph
N
A
G
G
I
N
G
More clues leading to the result NAGGING
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.
What does NAGGING mean?
NAGGING verb- To continuously remind or complain to (someone) in an annoying way, often about insignificant or unnecessary matters.
- To bother with persistent thoughts or memories.
- To bother or disturb persistently in any way.
- The action of the verb nag.
- Causing persistent mild pain, or annoyance.