Crossword Genius

Pa turns up with his little creature (5)

Ross

I believe the answer is:

aphis

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

'pa turns up with his' is the wordplay.
'turns up' is a reversal indicator.
'with' says to put letters next to each other.
'pa' written backwards gives 'ap'.
'ap'+'his'='APHIS'

Can you help me to learn more?

(Other definitions for aphis that I've seen before include "Small insect" , "Plant louse" , "Greenfly" , "sucker?" , "Sap-sucking garden pest" .)

I've seen this clue in the Evening Standard.
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