Not as many (5)

I believe the answer is:
fewer
'not as many' is the definition.
('few' can be the opposite of 'many' so perhaps 'fewer' is reasonable for 'not as many')
This is the entire clue.
(Other definitions for fewer that I've seen before include "Not so many" , "smaller number of people" , "in smaller numbers" , "Less in number" , "Reduced" .)