Crossword Genius

Writer's tearing almost all hair out (9)

Ross

I believe the answer is:

authorial

'writer's' is the definition.
(I know this)

'tearing almost all hair out' is the wordplay.
'tearing' is an anagram indicator.
'almost' means to remove the last letter (almost the whole word is kept).
'all' with its last letter taken off is 'al'.
'al'+'hair'+'out'='alhairout'
'alhairout' with letters rearranged gives 'AUTHORIAL'.

I've seen this clue in The Independent.
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