Compel to manufacture (4)
I believe the answer is:
make
This clue is a double definition.
'compel' is the first definition.
(I know that compel is a kind of make)
'to manufacture' is the second definition.
(I've seen this in another clue)
(Other definitions for make that I've seen before include "Fabricate" , "Keep the wolf from the door?" , "Produce" , "Construct, create" , "Create; a brand" .)