Cryptic crossword clue
Principle restricting liberal access to remote systems 6

The most common and most likely answer to this crossword clue is the 6 letter word TELNET

T
E
L
N
E
T

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The straight part
We know that "remote systems" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case remote systems = telnet.
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 TELNET mean?

TELNET noun
  1. A network protocol that enables one computer to communicate with another via the Internet; the program that acts as the client in this situation
TELNET verb
  1. To use such a program to make such a connection

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