Writer in favour of American technique, initially (6)
I believe the answer is:
proust
'writer' is the definition.
(Proust is an example)
'in favour of american technique initially' is the wordplay.
'in favour' becomes 'pro' (I've seen this before).
'of american' becomes 'us' (I've seen this in other clues).
'initially' suggests taking the first letters.
The first letter of 'technique' is 't'.
'pro'+'us'+'t'='PROUST'
(Other definitions for proust that I've seen before include "Great French writer in stupor" , "Great French novelist found in stupor" , "Marcel --, French novelist 1871-1922" , "French author" , "Marcel ---, Fr. author" .)