Crossword Genius

Child beginning to suck kind of rock (5)

Ross

I believe the answer is:

sprog

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'child' is the definition.
(informal term for a child)

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

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(Other definitions for sprog that I've seen before include "Baby (slang)" , "little one" , "Infant" , "Child; recruit (mil. slang)" , "Kid" .)

I've seen this clue in The Times.
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