3d. system meant to hold back ant (5) e-m-t
4d. obsession evident before job (13)p-e-c---a----
12a. possibly get a gold finish on cake.(7)
-a----
13d. wear out part of a car (7)--h----
20a. answer is a liqued mixture (8) -o-----n
3d. system meant to hold back ant - Emmet
4d. obsession evident before job - Preoccupation
12a. possibly get a gold finish on cake - Gateau
13d. wear out part of a car - Exhaust
20a. answer is a liqued mixture - ?