Pandas possibly put marks around enclosure (5,4)
I believe the answer is:
squad cars
'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".)