Make preparations (4,2)
(Other definitions for gear up that I've seen before include "Prepare to be more efficient" , "Make ready, prepare" .)
'make preparations' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for plan that I've seen before include "Diagram; design" , "Aim" , "'Scheme, strategy (4)'" , "Formulate" , "Off the right direction" .)