Be economical (6)
I believe the answer is:
scrimp
'be economical' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for scrimp that I've seen before include "Subsist on a meagre allowance; be thrifty" , "make economies" , "Skimp, stint" , "Be thrifty and parsimonious" , "Live meagrely" .)