Petite pooch, for short (3)
I believe the answer is:
pom
'petite pooch for short' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pom that I've seen before include "Limey in Oz" , "Brit abroad" , "Type of dog" , "English person" , "Englishman in Australia" .)