Place in position (3)
'place in position' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for put that I've seen before include "Place in a position" , "Place; placed" , "Place, lay" , "Place in a location" , "Set (in place)" .)
(Other definitions for install that I've seen before include "Fix in position ready for use" , "Settle" , "Lodge" , "place in office" , "Set up, ready for use" .)
(Other definitions for instate that I've seen before include "Put in possession" , "Establish, install" , "Tea tins (anag.)" , "Set up" .)