Cryptic crossword clue
The memo about resistance is the thing that reveals it 8

The most common and most likely answer to this crossword clue is the 8 letter word OHMMETER

O
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Buddy explains!

The straight part
We know that "the thing that reveals it" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the thing that reveals it = ohmmeter.
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 OHMMETER mean?

OHMMETER noun
  1. A portable device for measuring relatively small values of electrical resistance.

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