A subgroup in this dissection lab (4)

I believe the answer is:

sect

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

'a subgroup' is the definition.
(I've seen this in another clue)

'this dissection lab' is the wordplay.
'SECT' is hidden within the letters.
But, I'm uncertain how this is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for sect that I've seen before include "Breakaway group" , "Denomination" , "Small group with own religious beliefs" , "Nonconformist faction" , "Body of followers" .)

I've seen this clue in the Sydney Morning Herald.

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