The nation's strength (5)

I believe the answer is:

power

I believe this is a double definition.

'the nation's' is the first definition.
(power is a kind of nation)

'strength' is the second definition.
(I know that power is a type of strength)

(Other definitions for power that I've seen before include "Strength - capacity" , "Strength, force" , "Supremacy, force" , "Control and influence exercised over others" , "Physical strength" .)

I've seen this clue in the Evening Standard.

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