One's turned to crime in equal measure (9)
I believe the answer is:
isometric
'equal measure' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?
'one's turned to crime' is the wordplay.
'one's' becomes 'I's' (Roman numeral).
'turned' indicates an anagram.
'to'+'crime'='tocrime'
'tocrime' is an anagram of 'ometric'.
'is'+'ometric'='ISOMETRIC'
'in' is the link.
Can you help me to learn more?
(Other definitions for isometric that I've seen before include "Having equal dimensions" , "form of exercise" , "Type of exercise performed against resistant object" , "Type of angled drawing to scale - eroticism (anag)" , "regarding muscular action" .)