The way 50 make a pattern (5)
I believe the answer is:
model
'a pattern' is the definition.
(I know that model can be written as model)
'the way 50' is the wordplay.
'the way' becomes 'mode' ('mode' can be a synonym of 'way').
'50' becomes 'l' (Roman numeral).
'mode'+'l'='MODEL'
'make' acts as a link.
(Other definitions for model that I've seen before include "Moss, say" , "Small-size version" , "She exhibits clothes on the catwalk" , "Example to follow" , "Miniature replica" .)