Possibly lucky girl, on the quiet (3)

I believe the answer is:

dip

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'possibly lucky' is the definition.
I can't judge whether this defines the answer.

'girl on the quiet' is the wordplay.
'girl' becomes 'di' ().
'on' is a charade indicator (letters next to each other).
'the quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'di'+'p'='DIP'

Can you help me to learn more?

(Other definitions for dip that I've seen before include "Duck" , "Thick sauce; brief swim" , "Lower into liquid" , "A quick bathe" , "Sink downwards" .)

I've seen this clue in the Evening Standard.

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