Childish vehicles for retrospections without Pinter (8)

I believe the answer is:

scooters

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'childish vehicles' is the definition.
'scooters' can be an answer for 'vehicles' (scooter is a kind of vehicle). I am not sure about the 'childish' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for scooters that I've seen before include "Children's two-wheeled toys" , "Ducks to ride on two wheels?" , "Diving ducks and two-wheeled vehicles" , "Large black diving ducks" , "Ducks to ride on two-wheels?" .)

I've seen this clue in the Irish Times.

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