Inept force destroyed Utopian state (10)
I believe the answer is:
perfection
'utopian state' is the definition.
'perfection' can be an answer for 'state' (perfection is a kind of state). I'm unsure of the 'utopian' bit.
'inept force destroyed' is the wordplay.
'destroyed' indicates an anagram.
'inept'+'force'='ineptforce'
'ineptforce' anagrammed gives 'PERFECTION'.
Can you help me to learn more?
(Other definitions for perfection that I've seen before include "Faultlessness" , "Highest state" .)