Be an efficient controller of this unit: graph organised (3,1,5,4)
I believe the answer is:
run a tight ship
'be an efficient controller' is the definition.
(to run a tight ship is to run things efficiently)
'this unit graph organised' is the wordplay.
'organised' indicates anagramming the letters.
'this'+'unit'+'graph'='thisunitgraph'
'thisunitgraph' with letters rearranged gives 'RUN A TIGHT SHIP'.
'of' acts as a link.
(Other definitions for run a tight ship that I've seen before include "Exert discipline in organisation" , "Be in control of an efficient organisation" , "Be strict in managing an organisation" , "Oversee an efficient body" , "Enforce discipline" .)