Cryptic crossword clue
Colossi left floundering manage with electronic test instrument 12

The most common and most likely answer to this crossword clue is the 12 letter word OSCILLOSCOPE

I've seen this crossword clue in The Guardian
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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 OSCILLOSCOPE mean?

OSCILLOSCOPE noun
  1. An electronic measuring instrument that creates a visible two-dimensional graph, on a screen, of one or more continuously varying voltages or currents.

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