Not all foreigners possess power (5)

I believe the answer is:

reign

'power' is the definition.
(reign can mean time in power)

'not all foreigners possess' is the wordplay.
'not all' indicates the answer is hidden within the clue.
'REIGN' is hidden within 'foreigners possess'.

(Other definitions for reign that I've seen before include "Niger (anag)" , "Period of the rule of a sovereign" , "Wield the sceptre" , "are unbeatable!" , "Period of monarch" .)

I've seen this clue in the Evening Standard.

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