Cryptic crossword clue
Unpredictable measure said to be used by part of hospital

The most common and most likely answer to this crossword clue is the 7 letter word WAYWARD

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "Unpredictable" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unpredictable = wayward.
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 WAYWARD mean?

WAYWARD adjective
  1. Given to wilful, perverse deviation from the expected norm; tending to stray
  2. Obstinate, contrary and unpredictable
  3. Not on target

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