Economy in execution (3)
I believe the answer is:
cut
'economy' is the definition.
(both can mean a cost-saving measure)
'in execution' is the wordplay.
'in' indicates a hidden word.
'CUT' is hidden within 'execution'.
(Other definitions for cut that I've seen before include "Reduce; joint (of meat)" , "Shorten; remove" , "Sever, slice" , "Stop shooting!" , "Qualification mark during a golf event" .)