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Condensate on shellfish that kills parasites (8)

Ross

I believe the answer is:

dewormer

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'kills parasites' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'condensate on shellfish' is the wordplay.
'condensate' becomes 'dew' (dew is a kind of condensate).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'shellfish' becomes 'ormer' (ormer is a kind of shellfish).
'dew'+'ormer'='DEWORMER'

'that' is the link.

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