Crossword Genius

Pandas possibly put marks around enclosure (5,4)

Ross

I believe the answer is:

squad cars

I'm a little stuck... Click here to teach me more about this clue!

'pandas' is the definition.
Although both the answer and definition are plural nouns, I can't understand how one could define the other.

'put marks around enclosure' is the wordplay.
I cannot quite see how this works, but
'around' could be 'ca' (circa) and 'ca' is present in the answer.
This explanation may well be incorrect...

'possibly' is the link.

Can you help me to learn more?

(Another definition for squad cars that I've seen is " Police vehicles".)

I've seen this clue in The Independent.
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