Crossword Genius

Queen or Genesis rocking? That's going back! (10)

Ross

I believe the answer is:

regression

'going back' is the definition.
(regression is going backwards)

'queen or genesis rocking?' is the wordplay.
'queen' becomes 'r' (abbreviation for regina, e.g. in ER ).
'rocking?' indicates anagramming the letters (I've seen 'rocked' mean this).
'or'+'genesis'='orgenesis'
'orgenesis' anagrammed gives 'egression'.
'r'+'egression'='REGRESSION'

'that's' acts as a link.

(Another definition for regression that I've seen is " A return to a former state".)

I've seen this clue in The Telegraph.
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