Bizarre triangle involving former Queen before another ruler is named? (10)

I believe the answer is:

interregal

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

'another ruler is named?' is the definition.
I can't tell whether this definition defines the answer.

'bizarre triangle involving former queen' is the wordplay.
'bizarre' indicates an anagram.
'involving' indicates putting letters inside.
'former queen' becomes 'ER' (Elizabeth Regina, ie Queen Elizabeth).
'triangle' is an anagram of 'intregal'.
'intregal' enclosing 'er' is 'INTERREGAL'.

'before' is the link.

Can you help me to learn more?

(Another definition for interregal that I've seen is " between monarchs".)

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