Locating; placing (6)
I believe the answer is:
siting
I believe this clue is a double definition.
'locating' is the first definition.
('site' can be a synonym of 'locate')
'placing' is the second definition.
('site' can be a synonym of 'place')
(Other definitions for siting that I've seen before include "Placing in a specific location" , "Installing" , "Locating, positioning" .)