Crossword Genius

Go back out with foremost of Romeos for a start! (7)

Ross

I believe the answer is:

regress

'go back' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for regress that I've seen before include "Go back to earlier state, perhaps of health" , "Go backwards, disimprove" , "Lapse" , "Go back to a lower level" , "Return to former life" .)

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