Word "mourn" could produce a parasite (9)

I believe the answer is:

roundworm

'a parasite' is the definition.
(I've seen this before)

'word mourn could produce' is the wordplay.
'could produce' indicates anagramming the letters (I've seen this in other clues).
'word'+'mourn'='wordmourn'
'wordmourn' is an anagram of 'ROUNDWORM'.

(Another definition for roundworm that I've seen is " parasite perhaps".)

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

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