The most common and most likely answer to this crossword clue is the 6 letter word MORGUE
I've seen this crossword clue in The Daily Telegraph
M
O
R
G
U
E
Buddy explains!
The straight part
We know that "Place with stiff identification requirements" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case place with stiff identification requirements = morgue.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 MORGUE mean?
MORGUE noun- A supercilious or haughty attitude; arrogance.
- A building or room where dead bodies are kept before their proper burial or cremation, particularly in legal and law enforcement contexts.
- The archive and background information division of a newspaper.