Tory regularly embracing rocky movement? One talks nonsense (8)

I believe the answer is:

twaddler

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'one talks nonsense' is the definition.
The definition suggests a singular noun which matches the answer.

'tory regularly embracing rocky movement?' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'embracing' is an insertion indicator.
'rocky movement?' becomes 'waddle' (waddle is a kind of movement. I am not sure about the 'rocky' bit.).
The alternating letters of 'tory' are 'tr'.
'tr' enclosing 'waddle' is 'TWADDLER'.

Can you help me to learn more?

(Another definition for twaddler that I've seen is " One associated with cobblers".)

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