What a sovereign has to do (5)

I believe the answer is:

reign

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'do' is the definition.
The answer and definition can be both to do with social activities as well as being verbs in their base form.
Maybe you can see an association between them that I can't see?

'what a sovereign has' is the wordplay.
'REIGN' is hidden within the letters.
However, I am uncertain how this is indicated.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for reign that I've seen before include "Monarch's time in the job" , "Be champion" , "time in power" , "Dominion" , "Rule - dominate" .)

I've seen this clue in the Evening Standard.

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