Simple creature, sadly, drops goat (9)

I believe the answer is:

gastropod

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'simple creature' is the definition.
'gastropod' can be an answer for 'creature' (gastropod is a kind of creature). I'm unsure of the 'simple' bit.

'sadly drops goat' is the wordplay.
'sadly' indicates an anagram.
'drops'+'goat'='dropsgoat'
'dropsgoat' with letters rearranged gives 'GASTROPOD'.

Can you help me to learn more?

(Other definitions for gastropod that I've seen before include "Slimy type" , "Escargot" , "Could be snail" , "Little creature" , "slug, perhaps" .)

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

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