Give protection from active can shaken (9)

I believe the answer is:

vaccinate

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'give protection from' is the definition.
I can't judge whether this definition defines the answer.

'active can shaken' is the wordplay.
'shaken' is an anagram indicator.
'active'+'can'='activecan'
'activecan' is an anagram of 'VACCINATE'.

Can you help me to learn more?

(Other definitions for vaccinate that I've seen before include "prevent disease" , "Inoculate with ..." , "Immunise" .)

I've seen this clue in The Sun.

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