Placed hoop around a predatory mollusc (10)

I believe the answer is:

cephalopod

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

'a predatory mollusc' is the definition.
'cephalopod' can be an answer for 'mollusc' (cephalopod is a kind of mollusc). I am not sure about the 'a predatory' bit.

'placed hoop around' is the wordplay.
'around' is an anagram indicator.
'placed'+'hoop'='placedhoop'
'placedhoop' anagrammed gives 'CEPHALOPOD'.

Can you help me to learn more?

(Other definitions for cephalopod that I've seen before include "Squid" , "sea creature" .)

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

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