Unwanted yogurt oddly flushed away (3)

I believe the answer is:

out

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This could be a double definition.

'unwanted' is the first definition.
(as opposed to 'in' and fashionable)

'away' is the second definition.
(synonyms)

'yogurt oddly flushed' acts as a link.
I am not very happy about this link. Some or all of it may belong to one of the definitions.

Can you help me to learn more?

(Other definitions for out that I've seen before include "what batsman doesn't want to be" , "SECOND PART OF 11" , "Not within" , "Free" , "Heading back to the pavilion?" .)

I've seen this clue in The Independent.

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