Work by Timothy with article producing most favourable points (6)
I believe the answer is:
optima
'most favourable points' is the definition.
'work by timothy with article' is the wordplay.
'work' becomes 'op' (abbreviation for opus**).
'by' means one lot of letters go next to another.
'timothy' becomes 'tim' (I've seen this in other clues).
'with' is a charade indicator (letters next to each other).
'article' becomes 'a' (indefinite article).
'op'+'tim'+'a'='OPTIMA'
'producing' acts as a link.
(Other definitions for optima that I've seen before include "Conditions producing the best possible results" , "Points at which conditions are most favourable" , "Ideal conditions" .)