Crossword Genius

Flashback after divorce? (5,6)

Ross

I believe the answer is:

split second

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

'flashback after divorce?' is the definition.
I can't tell whether this definition defines the answer.

'flashback after divorce?' is the wordplay.
'flashback' becomes 'second' (I can't justify this - if you can you should believe this answer much more).
'after' means one lot of letters go next to another.
'divorce?' becomes 'split' (divorcing is a kind of splitting).
'second' after 'split' is 'SPLIT-SECOND'.

Can you help me to learn more?

(Other definitions for split second that I've seen before include "Instant" , "Very little time" , "Very brief moment of time" , "An extremely short time" , "Twinkling of an eye" .)

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