Headline story from page penned by hack (6)
I believe the answer is:
splash
'headline story' is the definition.
(as in a story splashed on the front page)
'page penned by hack' is the wordplay.
'page' becomes 'p'.
'penned by' means one lot of letters goes inside another (inserted letters are penned in).
'hack' becomes 'slash' (slash can mean to hack or chop).
'p' placed within 'slash' is 'SPLASH'.
'from' acts as a link.
(Other definitions for splash that I've seen before include "coming down of an astronaut" , "Cause liquid to fly about in drops" , "Big newspaper feature" , "Effect of body hitting water" , "Watery sound" .)