The most common and most likely answer to this crossword clue is the 8 letter word COPYCATS
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The straight part
We know that "imitators" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case imitators = copycats.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 COPYCATS mean?
COPYCATS noun- One who imitates or plagiarizes others' work.
- A criminal who imitates the crimes of another; specifically, a criminal who commits the same crime, especially a highly-publicized one, that has just been or recently committed by someone else.