Chained crazy spiny animal (7)

I believe the answer is:

echidna

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

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

'chained crazy' is the wordplay.
'crazy' is an anagram indicator.
'chained' with letters rearranged gives 'ECHIDNA'.

Can you help me to learn more?

(Other definitions for echidna that I've seen before include "Toothless type" , "Spiny creature" , "Insectivorous mammal" , "This insectivore" , "Prickly creature" .)

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

Want a hint initially instead of a full solution? Install my app