Fashionable writer will make his mark (8)
I believe the answer is:
inscribe
'his mark' is the definition.
'inscribe' can be an answer for 'mark' (thesaurus). I am unsure of the 'his' bit.
'fashionable writer' is the wordplay.
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'writer' becomes 'scribe' (scribe is a kind of writer).
'in'+'scribe'='INSCRIBE'
'will make' acts as a link.
Can you help me to learn more?
(Other definitions for inscribe that I've seen before include "Engrave; enter (name in list)" , "Engrave or write upon" , "Put dedication into" , "Write or cut words into a surface" , "autograph" .)