Cryptic crossword clue
Fine troubles with a heavy metal unlikely to miscarry 4-4

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

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Buddy explains!

The straight part
We know that "unlikely to miscarry" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unlikely to miscarry = fail safe.
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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