Figure needs energy in broken-down Acton (7)
I believe the answer is:
octagon
'figure' is the definition.
(type of geometrical figure)
'energy in broken-down acton' is the wordplay.
'energy' becomes 'go' (go can mean energy or enthusiasm).
'in' is an insertion indicator.
'broken down' indicates anagramming the letters.
'acton' is an anagram of 'octan'.
'go' inserted within 'octan' is 'OCTAGON'.
'needs' is the link.
(Other definitions for octagon that I've seen before include "Eight-sided figure" , "Figure with 8 sides" , "Eight-sided object" , "Geometric figure with eight sides" , "Shape of a square with the corners cut off" .)