Cryptic crossword clue
Triggering a single tax in effect

The most common and most likely answer to this crossword clue is the 10 letter word ACTIVATION

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

The straight part
We know that "Triggering" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case triggering = activation.
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 ACTIVATION mean?

ACTIVATION noun
  1. Making active and effective; bringing into a state of activity.
  2. The process of making a radioisotope by bombarding a stable element with neutrons or protons.
  3. (biochemistry) The process through which molecules are made able to react.

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