Wait ended after Queen rejected continental alliance twice (5,2)

I believe the answer is:

queue up

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'wait' is the definition.
Although both the answer and definition are verbs in their base form, I don't understand how they can define each other.

'ended after queen rejected continental alliance twice' is the wordplay.
I cannot really see how this works, but
'queen' could be 'qu' and 'qu' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for queue up that I've seen is " Form line when waiting".)

I've seen this clue in The Independent.

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