The most common and most likely answer to this crossword clue is the 5 plus 5 letter word NANNY STATE
I've seen this crossword clue in The Daily Telegraph
N
A
N
N
Y
S
T
A
T
E
Buddy explains!
The straight part
We know that "a regime fixated by health and safety" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a regime fixated by health and safety = nanny state.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.