One likes to chat old male up with right opening (10)

I believe the answer is:

motormouth

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'one likes to chat old male up' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'with right opening' is the wordplay.
'with right' becomes 'motor' (I can't justify this - if you can you should give a lot more credence to this answer).
'opening' becomes 'mouth' (mouth is a kind of opening).
'motor'+'mouth'='MOTORMOUTH'

Can you help me to learn more?

(Other definitions for motormouth that I've seen before include "Non-stop chatterbox" , "Someone who won't shut up" , "Constant talker" .)

I've seen this clue in The Guardian.

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