Ideal power structure embraces force (10)
I believe the answer is:
perfection
'ideal' is the definition.
(I know that perfection is a type of ideal)
'power structure embraces force' is the wordplay.
'power' becomes 'p' (symbol in physics).
'structure' becomes 'erection' (erection is a kind of structure).
'embraces' indicates putting letters inside.
'force' becomes 'F' (symbol used in Physics e.g. f=ma).
'erection' placed around 'f' is 'erfection'.
'p'+'erfection'='PERFECTION'
(Other definitions for perfection that I've seen before include "Highest state" , "Faultlessness" .)