Cryptic crossword clue
Fellow Scotswoman has iron that’s unlikely to go wrong 4-4

The most common and most likely answer to this crossword clue is the 9 letter word FAIL-SAFE

I've seen this crossword clue in Independent
F
A
I
L
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S
A
F
E

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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 FAIL-SAFE mean?

FAIL-SAFE noun
  1. A device, mechanism or measure designed to make something fail-safe.
FAIL-SAFE verb
  1. To compensate automatically, in the event of a failure.
  2. To make a device or mechanism fail-safe, or to add a fail-safe device or mechanism to an existing system.
FAIL-SAFE adjective
  1. That does not cause undue damage in the event of failure.
  2. Designed to shut off for safety if an emergency occurs.

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