Two little boys resembling each other? (5)

I believe the answer is:

alike

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

'resembling each other?' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for alike that I've seen before include "Dull pain" , "Share and share . . . . . - even Stephen" , "In a similar way" , "Undistinguished" , "Similar, analogous" .)

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