The most common and most likely answer to this crossword clue is the 7 letter word REGENCY
I've seen this crossword clue in The Guardian
R
E
G
E
N
C
Y
More clues leading to the result REGENCY
- Dope entering battle, forgetting the first rule
- Proxy rule regarding unopened office
- Rule in operation without a monarch ascending, previously?
- Cry off limiting gene modification in a certain style
- Queen reviewed info about unknown architectural style
- Early 19th century vehicle’s identified by this concise encyclopedia
- There’s remarkable energy about Conservative when deputy leader’s in charge
- Period style from green regeneration on city outskirts
- Form of energy involving carbon, as a rule
- Period in the UK's green city, extremely critical
Buddy explains!

The straight part
We know that "Proxy rule" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case proxy rule = regency.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 REGENCY mean?
REGENCY noun- A system of government that substitutes for the reign of a king or queen when that king or queen becomes unable to rule.
- The time during which a regent is in power.
- An administrative division ranking below a province in Indonesia.