A child completely friendless (3)

I believe the answer is:

tot

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'a child' is the definition.
(term for a young child)

I cannot understand how the remainder of the clue works.

(Other definitions for tot that I've seen before include "Spirit measure" , "quick drink" , "slug?" , "Child; measure of spirits" , "Small drink of spirits" .)

I've seen this clue in the Evening Standard.

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