The most common and most likely answer to this crossword clue is the 6 letter word JERBOA
I've seen this crossword clue in Financial Times
J
E
R
B
O
A
More clues leading to the result JERBOA
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The straight part
We know that "a little animal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a little animal = jerboa.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 JERBOA mean?
JERBOA noun- Any of a number of species comprising most of the family Dipodidae, native to the deserts of Asia and northern Africa, being a small, jumping rodent with a long tufted tail, very small forefeet and very long hind legs.