Crossword Genius

Grub originally revealed in rock (5)

Ross

I believe the answer is:

larva

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'grub' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for larva that I've seen before include "shows form of immaturity" , "a developmental stage" , "Maggot" , "Insect's feeding stage" , "Worm-like insect before metamorphosis" .)

I've seen this clue in The Telegraph.
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