Number making do with Japanese Buddhism (5)
I believe the answer is:
dozen
'number' is the definition.
(dozen is a kind of number)
'do with japanese buddhism' is the wordplay.
'with' means one lot of letters go next to another.
'japanese buddhism' becomes 'zen' (I've seen this before).
'do'+'zen'='DOZEN'
'making' is the link.
(Other definitions for dozen that I've seen before include "See 4" , "Group of 12" , "Twelve (or thirteen for a baker?)" , "Group of twelve" , "Set of twelve" .)