From a hundred, point fifty are outstandingly good (5)
I believe the answer is:
excel
'are outstandingly good' is the definition.
I can't tell whether this definition defines the answer.
'from a hundred point fifty' is the wordplay.
'from' becomes 'ex' ('from' in Latin).
'a hundred' becomes 'C' (Roman numeral).
'point' becomes 'E' (compass point).
'fifty' becomes 'l' (Roman numeral).
'ex'+'c'+'e'+'l'='EXCEL'
Can you help me to learn more?
(Other definitions for excel that I've seen before include "Surpass; shine" , "Show brilliance" , "Be exceptionally good (at a subject)" , "Be superior to" , "Be very good at, better than others" .)