The most common and most likely answer to this crossword clue is the 4 letter word PUMA
I've seen this crossword clue in The Guardian
P
U
M
A
More clues leading to the result PUMA
- Beast turning up — turning up in the morning
- Cat starts to prowl around without hesitation
- Cat turning up with parent
- Getting back, have left bed for cat
- For all to see in May for example, a wild animal
- Find in the morning out of bed retired Argentinian rugby player
- Turn up with mother cat
- First glimpse of pussy, I’m not sure a cougar
- Recall a fool dropping favourite cat
- In front of mother, lifted winning 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 = puma.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 PUMA mean?
PUMA noun- The mountain lion or cougar, Puma concolor.
- A woman in her 20s or 30s who seeks relationships with younger men; a younger cougar.