The most common and most likely answer to this crossword clue is the 3 letter word MOG
M
O
G
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 = mog.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 MOG mean?
MOG noun- A young cow or bull.
- Leather made of the skin of the calf; especially, a fine, light-coloured leather used in bookbinding.
- A young deer, elephant, seal, whale or giraffe (also used of some other animals).
- A chunk of ice broken from a larger glacier, ice shelf, or iceberg.
- A small island, near a larger island.
- A cabless railroad engine.
- An awkward or silly boy or young man; any silly person; a dolt.
- The back of the leg below the knee.
- The muscle in the back of the leg below the knee.
- A female child, adolescent, or a young woman.
- A young female animal.
- (sometimes offensive) A woman, especially a young woman
- A female servant; a maid. (see usage notes)
- A queen (the playing card.)
- A term of endearment. (see usage notes)
- One's girlfriend.
- One's daughter.
- A roebuck two years old.
- Cocaine, especially in powder form.
- (somewhat childish) A female (tree, gene, etc).
- A boy or man who is weak or sentimental.
- A domestic cat, especially a non-pedigree or unremarkable cat.
- A kind of cake made with ginger, treacle, etc.
- An effigy, typically made of straw and dressed in old clothes, fixed to a pole in a field to deter birds from eating seeds or crops planted there.
- A tall, thin, awkward person.
- Anything that appears terrifying but presents no danger.
- A person clad in rags and tatters.
- A bird, the black tern.
- A slut, a sexually promiscuous woman.
- A dirty and untidy woman.
- To move away; to go off.
- (pickup community) To assert one's dominance over.