Let in large Latin criminal that's reputedly dangerous (1,6,8)

I believe the answer is:

a little learning

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

'reputedly dangerous' is the definition.
I can't judge whether this definition defines the answer.

'let in large latin criminal' is the wordplay.
'criminal' indicates anagramming the letters.
'let'+'in'+'large'+'latin'='letinlargelatin'
'letinlargelatin' is an anagram of 'A LITTLE LEARNING'.

'that's' acts as a link.

Can you help me to learn more?

(Another definition for a little learning that I've seen is " Danger for Pope".)

I've seen this clue in The Irish Times.

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