Cryptic crossword clue
A fever, reduced vastly after treatment — it’ll release tension 6,5

The most common and most likely answer to this crossword clue is the 6 plus 5 letter word SAFETY VALVE

I've seen this crossword clue in The Times
S
A
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Buddy explains!

The straight part
We know that "it’ll release tension" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it’ll release tension = safety valve.
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 SAFETY VALVE mean?

SAFETY VALVE noun
  1. A relief valve set to open at a pressure below that at which a container (such as a boiler) would burst.
  2. Any mechanism offering relief from pressure or tension, e.g. emotionally.

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