Crossword Genius

Overlooked socialist sleeping (4,3)

Ross

I believe the answer is:

left out

I'm a little stuck... Click here to teach me more about this clue!

'overlooked' is the definition.
The answer and definition can be both related to thinking as well as being past participle verbs.
Maybe there's a link between them I don't understand?

'socialist sleeping' is the wordplay.
'socialist' becomes 'left' (associated in meaning).
'sleeping' becomes 'out' (I've seen this before).
'left'+'out'='LEFT OUT'

Can you help me to learn more?

(Another definition for left out that I've seen is " Omitted".)

I've seen this clue in the Sydney Morning Herald.
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