Protection from influenza, eg isolation (5)

I believe the answer is:

aegis

'protection' is the definition.
(aegis can mean someone's guidance or protection)

'from influenza eg isolation' is the wordplay.
'from' says the answer is hidden in the clue.
'AEGIS' is hidden within 'influenza eg isolation'.

(Other definitions for aegis that I've seen before include "Protection (originally a shield)" , "Kindly endorsement and guidance" , "Protection (of someone)" , "shelter" , "Protection, backing" .)

I've seen this clue in The Guardian.

Want a hint initially instead of a full solution? Install my app