Power cut all round makes a prominent story (6)
I believe the answer is:
splash
'a prominent story' is the definition.
(I've seen this before)
'power cut all round' is the wordplay.
'power' becomes 'p' (symbol in physics).
'cut' becomes 'slash' (slashing is a kind of cutting).
'all round' means one lot of letters goes inside another.
'p' placed inside 'slash' is 'SPLASH'.
'makes' acts as a link.
(Other definitions for splash that I've seen before include "Cause water to fly about, make wet" , "Spend freely or make wet" , "Effect of hitting water (or headlines!)" , "Scatter liquid - prominent newspaper photo" , "Sound of dive" .)