9 down
Poor
girl
almost
regrets
son
going
back
(13)
Poor girl almost regrets son going back (13)
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The definition is at the end of the clue.
How the clue works
going back is the definition for RETROGRESSING. The word "Poor" is the anagram signal, and the fodder is "girl" with its last letter dropped ("almost" gives GIR) plus "regrets" and "son", making GIRREGRETSSON, which rearranges into RETROGRESSING.