Cryptic crossword clue
Reversal of rule brought into play changed system for online subscribers 7

The most common and most likely answer to this crossword clue is the 7 letter word PAYWALL

I've seen this crossword clue in The Guardian
P
A
Y
W
A
L
L

Buddy explains!

The straight part
We know that "system for online subscribers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case system for online subscribers = paywall.
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 PAYWALL mean?

PAYWALL noun
  1. A feature of a website, application or service that only allows access to certain content or functions upon payment.
PAYWALL verb
  1. To restrict access to (a Web site or other resource) by means of a paywall.

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