The most common and most likely answer to this crossword clue is the 6 letter word OCELOT
I've seen this crossword clue in The Guardian
O
C
E
L
O
T
More clues leading to the result OCELOT
- Cat in church, see, hiding in books there?
- Old Gaelic speaker possibly sheltering old cat
- Cat English see in October
- Old group allowing in church cat
- Duck kept by old, old Briton for cat
- Fortune accompanies old church cat
- A month without Leo playing the cat
- 17 in another clue too, but not for anyone to see
- Animal turns up to the French company
- Playing cello heartlessly to cat
Buddy explains!

The straight part
We know that "cat" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cat = ocelot.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 OCELOT mean?
OCELOT noun- An American feline carnivore (Felis pardalis) covered with blackish ocellated spots and blotches which are variously arranged.