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Wake up and photograph Oscar in costume (4,3,2,2)

Ross

I believe the answer is:

snap out of it

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'wake up' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'photograph oscar in costume' is the wordplay.
'photograph' becomes 'snap' (synonyms).
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'in' means one lot of letters goes inside another.
'costume' becomes 'outfit' (I've seen this before).
'o' going inside 'outfit' is 'outofit'.
'snap'+'outofit'='SNAP OUT OF IT'

'and' acts as a link.

Can you help me to learn more?

(Other definitions for snap out of it that I've seen before include "quickly recover" , "cheer themselves up?" , "Come to" , "suddenly give up" , "What one raiding photo album may take" .)

I've seen this clue in The Times.
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