Not much of a dog? (3)

I believe the answer is:

pom

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'dog?' is the definition.
(short for Pomeranian)

I cannot understand how the remainder of the clue works.

(Other definitions for pom that I've seen before include "Disparaging term for English immigrants to the Antipodes" , "English person" , "expat Englishman" , "best friend?" , "Small dog (colloq.)" .)

I've seen this clue in the Evening Standard.

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