Rolls on front by applying pressure steadily (4)
I believe the answer is:
baps
'rolls' is the definition.
(bap can mean a bread roll)
'front by applying pressure steadily' is the wordplay.
'front' indicates taking the first letters.
The initial letters of 'by applying pressure steadily' is 'BAPS'.
'on' is the link.
(Other definitions for baps that I've seen before include "Round rolls of soft bread" , "buns" .)