Spot girl in the afternoon, signalling (3,4)
I believe the answer is:
pip emma
'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" .)