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Lastly, shake anti-viral fluid before opening it (7,8)

Ross

I believe the answer is:

italian vermouth

I'm a little stuck... Click here to teach me more about this clue!

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

'lastly shake anti-viral fluid before opening' is the wordplay.
I cannot really see how this works, but
'fluid' could be 'vermouth' (vermouth is a kind of fluid) and 'vermouth' is found within the answer.
The remaining letters 'italian' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for italian vermouth that I've seen before include "Drink" , "two words for it!" , "It expanded" .)

I've seen this clue in The Guardian.
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