Foul udon eaten as pastime (4)

I believe the answer is:

ludo

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'pastime' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'foul udon eaten' is the wordplay.
'eaten' indicates the answer is hidden within the clue.
'LUDO' can be found hidden inside 'foul udon'.

'as' acts as a link.

Can you help me to learn more?

(Other definitions for ludo that I've seen before include "Traditional board game" , "Race game" , "Simple board game, involving dice" , "Children's board game" , "Type of board game" .)

I've seen this clue in The Mirror.

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