Presumably he doesn't mind being sacked at Christmas (5)

I believe the answer is:

santa

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'presumably he doesn't mind being sacked at christmas' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for santa that I've seen before include "Dec's visitor?" , "St Nicholas" , "Christmas visitor" , "generous visitor" , "generous figure" .)

I've seen this clue in The Guardian.

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