Striking matches mother put out (9,5)

I believe the answer is:

identical twins

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'striking matches' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for identical twins that I've seen is " Certain siblings".)

I've seen this clue in The Sunday Times.

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