Tory pamphlet regularly disowns part of Labour (11)

I believe the answer is:

contraction

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'part of labour' is the definition.
'contraction' can be an answer for 'part' (contraction is a kind of part). I'm unsure of the 'of labour' bit.

'tory pamphlet regularly disowns' is the wordplay.
'tory' becomes 'con' (abbreviation for Conservative).
'pamphlet' becomes 'tract' (synonyms).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'disowns' are 'ion'.
'con'+'tract'+'ion'='CONTRACTION'

Can you help me to learn more?

(Other definitions for contraction that I've seen before include "Isn't, for instance" , "Process of size reduction" .)

I've seen this clue in The Times.

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