Male nickname for female writer and activist (6)

I believe the answer is:

sontag

'female writer and activist' is the definition.
(Susan Sontag 1933-2004 the American writer)

'male nickname' is the wordplay.
'male' becomes 'son' (male child).
'nickname' becomes 'tag' (I've seen this in another clue).
'son'+'tag'='SONTAG'

'for' acts as a link.

(Another definition for sontag that I've seen is " American literary figure and political activist, d. 2004 - tangos (anag)".)

I've seen this clue in The Guardian.

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