First half of series about writers, one writer in particular (7)
I believe the answer is:
spenser
'one writer in particular' is the definition.
I can't judge whether this defines the answer.
'first half of series about writers' is the wordplay.
'first half of' indicates taking half.
'about' means one lot of letters goes inside another.
'writers' becomes 'pens' (I've seen this before).
'series' halved is 'ser'.
'ser' enclosing 'pens' is 'SPENSER'.
(Other definitions for spenser that I've seen before include "He wrote" , "English poet of 'The Faerie Queene'" , "The Faerie Queene author" , "Elizabethan poet" , "Edmund -, Eng. poet" .)