Bug (a verb) - enter it wrongly (12)

I believe the answer is:

invertebrate

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'bug' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'a verb enter it wrongly' is the wordplay.
'wrongly' indicates anagramming the letters.
'a'+'verb'+'enter'+'it'='averbenterit'
'averbenterit' with letters rearranged gives 'INVERTEBRATE'.

Can you help me to learn more?

(Other definitions for invertebrate that I've seen before include "Sort of creature" , "missing cord" , "Animal without a backbone" , "leech, say" , "Backboneless creature" .)

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

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