The most common and most likely answer to this crossword clue is the 10 letter word PROGNOSTIC
I've seen this crossword clue in The Times
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More clues leading to the result PROGNOSTIC
Buddy explains!
The straight part
We know that "predicting how complaint will go" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case predicting how complaint will go = prognostic.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 PROGNOSTIC mean?
PROGNOSTIC noun- Prognosis
- A sign by which a future event may be known or foretold.
- A prediction of the future.
- One who predicts the future.
- Of, pertaining to or characterized by prognosis or prediction.