The most common and most likely answer to this crossword clue is the 3 letter word PRY
I've seen this crossword clue in The Times
P
R
Y
More clues leading to the result PRY
- Poke nose into party regularly
- Odd characters in party are very intrusive
- Snoop quietly online
- Lively, not starting to snoop
- Look into head of public railway
- Characters not even attending party act curiously
- Nose and winkle
- Party regularly ignored peer
- Lively but not starting to be inquisitive
- Snoop quietly by railway
Buddy explains!

The straight part
We know that "are very intrusive" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case are very intrusive = pry.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 PRY mean?
PRY noun- The act of prying.
- An excessively inquisitive person.
- To look where one is not welcome; to be nosy.
- To keep asking about something that does not concern one.
- To look closely and curiously at (something closed or not public).
- A lever.
- Leverage.
- To use leverage to open or widen.