He doesn't go to any parties (7)

I believe the answer is:

mugwump

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'he doesn't go to any parties' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is the entire clue.

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(Other definitions for mugwump that I've seen before include "Fence-sitter (originally, big chief)" , "(In American) boss man" .)

I've seen this clue in The Globe and Mail.

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