Come through for Tory's first offensive (8)
I believe the answer is:
protrude
'come through' is the definition.
(to protrude is to come through or stand out)
'for tory's first offensive' is the wordplay.
'for' becomes 'pro' (as in being 'pro' something).
'tory's first' becomes 't' (1st letter of 'tory').
'offensive' becomes 'rude'.
'pro'+'t'+'rude'='PROTRUDE'
(Other definitions for protrude that I've seen before include "Jut out" , "Stand out" , "Stick out, project from a surface" , "Thrust forward" , "Point out" .)