The most common and most likely answer to this crossword clue is the 6 letter word TANNOY
I've seen this crossword clue in The Daily Telegraph
T
A
N
N
O
Y
Buddy explains!

The straight part
We know that "PA" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pa = tannoy.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 TANNOY mean?
TANNOY noun- A public address system
- To transmit, or communicate with, by means of a public address system.