Naughty pair I let in zoology class (8)

I believe the answer is:

reptilia

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

'zoology class' is the definition.
'Reptilia' can be an answer for 'class' (Reptilia is an example). I'm unsure of the 'zoology' bit.

'naughty pair i let' is the wordplay.
'naughty' is an anagram indicator.
'pair'+'i'+'let'='pairilet'
'pairilet' is an anagram of 'REPTILIA'.

'in' is the link.

Can you help me to learn more?

(Other definitions for reptilia that I've seen before include "Class of cold-blooded animals" , "Class including lizards" .)

I've seen this clue in The Independent.

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