Crossword Genius

Having us dress when the siren goes off. It’s early (7)

Ross

I believe the answer is:

sunrise

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

'having us dress when' is the definition.
I can't judge whether this defines the answer.

'siren goes off it's early' is the wordplay.
I cannot quite see how this works, but
an anagram of 'siren' is 'nrise' which is located in the answer.
This explanation may well be incorrect...

'the' acts as a link.

Can you help me to learn more?

(Other definitions for sunrise that I've seen before include "Dawning of the day" , "It gets the day off to a bright start" , "The first light of day" , "Time of full daylight" , "everyday occurrence in the East" .)

I've seen this clue in the Evening Standard.
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