Exempt or protected, from disease perhaps (6)

I believe the answer is:

immune

(Other definitions for immune that I've seen before include "Resistant, unaffected" , "Inoculated or exempt" , "safe from a particular disease" , "Resistant (to infection)" , "Exempt, invulnerable" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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