Regularly need farm for dairy product (4)
I believe the answer is:
edam
'dairy product' is the definition.
(Edam is an example)
'regularly need farm' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'need'+'farm'='needfarm'
The alternating letters of 'needfarm' are 'EDAM'.
'for' is the link.
(Other definitions for edam that I've seen before include "Cheese made in Holland" , "Round, yellow cheese" , "Dutch specialty" , "something to have with crackers" , "Spherical cheese" .)