Child; sea creature (6)

I believe the answer is:

urchin

This clue is a double definition.

'child' is the first definition.
(I know that urchin is a type of child)

'sea creature' is the second definition.
(I've seen this before)

(Other definitions for urchin that I've seen before include "Sea creature with a spiny shell" , "Waif" , "Capital of Kenya" , "Ragged boy" , "seafood for some" .)

I've seen this clue in The Times.

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