Crossword Genius

Exercising authority at home, nationalist deportations beginning (2,7)

Ross

I believe the answer is:

in command

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

'home nationalist deportations beginning' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'exercising authority at' is the wordplay.
I cannot really understand how this works, but
'authority' could be 'command' (command is a kind of authority) and 'command' is located in the answer.
'at' could be 'in' (synonymous in some cases - eg at school, in school) and 'in' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.
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