Has nothing to do with why people won't join Labour? (8)

I believe the answer is:

idleness

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'labour?' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see an association between them that I don't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for idleness that I've seen before include "pansy growers find love in?" , "Reluctance to work" , "not working" , "I'm having nothing to do" , "Lazy behaviour" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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