The most common and most likely answer to this crossword clue is the 8 letter word ECHIDNAS
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The straight part
We know that "beasts like anteaters" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case beasts like anteaters = echidnas.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 ECHIDNAS mean?
ECHIDNAS noun- Any of the species of small spined monotremes in family Tachyglossidae, the four extant species of which are found in Australia and southern New Guinea.