Cruelly chained an insectivorous animal (7)

I believe the answer is:

echidna

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

'an insectivorous animal' is the definition.
'echidna' can be an answer for 'animal' (echidna is a kind of animal). I'm not sure about the 'an insectivorous' bit.

'cruelly chained' is the wordplay.
'cruelly' indicates an anagram (I've seen this in other clues).
'chained' anagrammed gives 'ECHIDNA'.

Can you help me to learn more?

(Other definitions for echidna that I've seen before include "Little animal" , "Oz native" , "This insectivore" , "Spiny Aus. mammal" , "Spiny creature" .)

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

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