The kings we blessed five times out of seven? (10)

I believe the answer is:

weeknights

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'blessed five times out of seven?' is the definition.
I can't tell whether this definition defines the answer.

'the kings we' is the wordplay.
'the kings we' anagrams to 'WEEKNIGHTS'.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Another definition for weeknights that I've seen is " They generally divide working days".)

I've seen this clue in The Telegraph.

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