Crossword Genius

Small stone lodged in baby tooth (8)

Ross

I believe the answer is:

sprocket

'tooth' is the definition.
(I know that sprocket is a type of tooth)

'small stone lodged in baby' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'stone' becomes 'rock' (synonyms).
'lodged in' is an insertion indicator.
'baby' becomes 'pet'.
'rock' placed within 'pet' is 'procket'.
's'+'procket'='SPROCKET'

(Other definitions for sprocket that I've seen before include "Tooth for driving mechanism" , "Something like gear" , "Wheel with projecting teeth" , "Series of teeth on wheel engaging with chain" , "sort of wheel" .)

I've seen this clue in The Independent and The Times.
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