Set out scheme in document (8)
I believe the answer is:
deployed
'set' is the definition.
(thesaurus)
'scheme in document' is the wordplay.
'scheme' becomes 'ploy' (I have seen 'Tactical scheme' mean 'ploy' so perhaps 'scheme' could also mean 'ploy').
'in' is an insertion indicator.
'document' becomes 'deed' (deed is a kind of document).
'ploy' placed into 'deed' is 'DEPLOYED'.
'out' is the link.
(Other definitions for deployed that I've seen before include "Moved troops into position for action" , "Used" , "Placed troops in battle formation" , "Established" , "Put" .)