The most common and most likely answer to this crossword clue is the 5 letter word PEPYS
I've seen this crossword clue in The Guardian
P
E
P
Y
S
More clues leading to the result PEPYS
- Old journalist's vitality, say, returning on vacation
- Diarist has a furtive look, reportedly
- Reported looks of a chronicler of his age
- Life agreed to drop English diarist
- Naval administrator in picture frame turned spy
- Record year covered by extremely pompous diarist
- Old journalist’s yen to spike unfinished drink
- Extremely perceptive foreign spy becomes a diarist
- Various happy events haven’t escaped author of a 23
- Chronicler sneaks a look at broadcast
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.