The most common and most likely answer to this crossword clue is the 9 letter word KISSOGRAM
I've seen this crossword clue in The Times
K
I
S
S
O
G
R
A
M
More clues leading to the result KISSOGRAM
- Peckish delivery person?
- Visitor given access based on pecking order?
- Affectionate message retiring chap’s received is really grand
- Service provider Mark is so grammatically particular
- Hearsay I found in book about surprise guest?
- Woman’s disgusted about losing Charlie’s delivery of smack
- Girl entertaining a gross eccentric in birthday surprise?
Buddy explains!

The straight part
We know that "Visitor given access based on pecking order" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case visitor given access based on pecking order = kissogram.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.
Crossword Answer definitions
KISSOGRAM noun- A message delivered along with a kiss, usually arranged as a surprise on a special occasion.