Writer I attack going up street (7)
I believe the answer is:
diarist
'writer' is the definition.
(diarist is a kind of writer)
'i attack going up street' is the wordplay.
'attack' becomes 'raid' (raiding is a kind of attacking).
'going up' is a reversal indicator.
'street' becomes 'st'.
'i'+'raid'='iraid'
'iraid' back-to-front is 'diari'.
'diari'+'st'='DIARIST'
(Other definitions for diarist that I've seen before include "eg Samuel Pepys" , "One who keeps a daily record, like Samuel Pepys" , "Writer" , "Person who keeps daily record of activities, like Samuel Pepys" , "He makes entries" .)