Neglected child makes about turn, pilfering one biscuit (5)

I believe the answer is:

wafer

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'one biscuit' is the definition.
(I know that Wafer is a type of biscuit)

I don't understand the rest of the clue.

(Other definitions for wafer that I've seen before include "Very thin 14 Down" , "Very thin slice" , "Ice-cream biscuit" , "A very thin plain biscuit" , "Piece of bread" .)

I've seen this clue in The Irish Times.

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