Cryptic crossword clue
Part of system — it purportedly boosted computer availability 6

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

U
P
T
I
M
E

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The straight part
We know that "computer availability" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case computer availability = uptime.
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 UPTIME mean?

UPTIME noun
  1. The period of time a computer has functioned since last requiring a reboot.

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