Aphrodisiac sets Roy off (7)

I believe the answer is:

oysters

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'aphrodisiac sets roy off' is the definition.
I can't judge whether this defines the answer.

'sets roy off' is the wordplay.
'off' is an anagram indicator.
'sets'+'roy'='setsroy'
'setsroy' is an anagram of 'OYSTERS'.

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(Other definitions for oysters that I've seen before include "Yet Ross can find the marine creatures" , "Yet Ross has these strange marine creatures" , "Succulent bivales" , "Yet Ross, strangely, has the marine creatures" , "Marine molluscs" .)

I've seen this clue in The Telegraph.

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