Pilot Officer Moorhead's little pet (3)
I believe the answer is:
pom
'little pet' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'pilot officer moorhead's' is the wordplay.
'pilot officer' becomes 'po' (short for pilot officer).
'moorhead' becomes 'm' (head letter of 'moor').
'po'+'m'='POM'
Can you help me to learn more?
(Other definitions for pom that I've seen before include "best friend?" , "Limey in Oz" , "Disparaging term for English immigrants to the Antipodes" , "Brit abroad" , "Britisher in Oz" .)