Crossword Genius

…to back up writer describing privates? (5)

Ross

I believe the answer is:

pubic

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'to back up writer describing privates?' is the definition.
I can't judge whether this definition defines the answer.

'to back up writer' is the wordplay.
'to back' says the letters should be written in reverse.
'writer' becomes 'bic' (kind of pen).
'up' in reverse letter order is 'pu'.
'pu'+'bic'='PUBIC'

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