Crossword Genius

Spot girl in the afternoon, signalling (3,4)

Ross

I believe the answer is:

pip emma

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'the afternoon signalling' is the definition.
I can't tell whether this defines the answer.

'spot girl' is the wordplay.
'spot' becomes 'pip' (both can mean a small amount).
'girl' becomes 'Emma' (girl's name).
'pip'+'emma'='PIP-EMMA'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for pip emma that I've seen before include "Dated term for p.m." , "after midday" , "Afternoon for the military" , "Afternoon on the radio" .)

I've seen this clue in The Guardian.
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