Cryptic crossword clue
Small group of families America turned back at frontier 8

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

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

The straight part
We know that "Small group of families" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case small group of families = suborder.
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 SUBORDER mean?

SUBORDER noun
  1. A taxonomic category below order and above infraorder.

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