Foreign rule? (5)

I believe the answer is:

reign

I'm a little stuck... Click here to teach me more about this clue!

'foreign rule?' is the definition.
'reign' can be an answer for 'rule?' (reign is a kind of rule). I'm not certain of the 'foreign' bit.

'foreign rule?' is the wordplay.
'REIGN' is hidden within the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for reign that I've seen before include "Time on throne" , "Sovereign's rule" , "Have sovereign power" , "Prevail" , "Rule over in Niger" .)

I've seen this clue in the Evening Standard.

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