Cryptic crossword clue
Magazine’s second row security system 4,4

The most common and most likely answer to this crossword clue is the 4 plus 4 letter word TIME LOCK

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "security system" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case security system = time lock.
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.

Crossword Answer definitions

TIME LOCK noun
  1. A lock, typically on a door in a bank vault, that cannot be unlocked before a specified time.

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