Cryptic crossword clue
In Perth headmaster has no alternative: if that is resistance, one delivers correction 9

The most common and most likely answer to this crossword clue is the 9 letter word RECTIFIER

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Buddy explains!

The straight part
We know that "one delivers correction" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one delivers correction = rectifier.
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 RECTIFIER mean?

RECTIFIER noun
  1. Something that rectifies.
  2. A device that converts alternating current into direct current; often a diode.
  3. An instrument used for determining and rectifying the variations of the compass on board ship.
  4. (artificial neural networks) The activation function f(x) = \max(0, x), where x is the input to a neuron.

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