A little pet (3)

I believe the answer is:

pom

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'a little pet' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?

This is the entire clue.

Can you help me to learn more?

(Other definitions for pom that I've seen before include "Limey in Oz" , "Englishman in Australia" , "Brit abroad" , "Australian slang for British migrant" , "expat Englishman" .)

I've seen this clue in the Evening Standard.

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