Crossword Genius

Hands-free connection with this number? (3,2,4,2,7)

Ross

I believe the answer is:

yes we have no bananas

I'm a little stuck... Click here to teach me more about this clue!

'hands-free connection with this number?' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'hands-free connection with this number?' is the wordplay.
I cannot really understand how this works, but
'hands' could be 'bananas' (I've seen this before) and 'bananas' is found within the answer.
'with' could be 'w' (abbreviation) and 'w' is found in the answer.
'number?' could be 'v' (V is an example) and 'v' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for yes we have no bananas that I've seen before include "No show of hands" , "none of us have a hand in" , "song" .)

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