Uncaught criminals are still at it (5)

I believe the answer is:

large

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

'uncaught' is the definition.
Both the answer and definition are adjectives.
Perhaps they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for large that I've seen before include "Massive" , "substantial" , "Bulky" , "Titanic" , "Big, almost regal" .)

I've seen this clue in The Globe and Mail.

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