Portuguese king ultimately letting queen be in command (5)

I believe the answer is:

reign

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'be in command' is the definition.
'reign' can be an answer for 'command' (thesaurus). I'm not sure about the 'be in' bit.

'portuguese king ultimately letting queen' is the wordplay.
'portuguese king' becomes 'rei' (I've seen this in another clue).
'ultimately' indicates one should take the final letters.
The final letters of 'letting queen' are 'gn'.
'rei'+'gn'='REIGN'

Can you help me to learn more?

(Other definitions for reign that I've seen before include "Monarch's rule" , "Rule over in Niger" , "Period during which someone is dominant" , "Dominion" , "Occupy the throne" .)

I've seen this clue in The Independent.

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